A monkey on a raft is crossing a river that flows to the east at 8.0m/s. His top paddling speed is 12.0m/sec. He points due south and attempts to cross. If the river is 120m wide, how far downstream will he end up when he reaches the other side?
Answers
The relation of uniform movement allows to find the result for the distance that descended when crossing the river is:
d = 180 m
Given parameters
The velocity of the river [tex]v_r[/tex] = 8.0 m / s towards the East The speed of the monkey [tex]v_m[/tex] = 12.0 m / s towards the south River width x = 120 mTo find
Distance downstream when crossing.
Velocity is a vector magnitude, it has modulus and direction, therefore vector algebra must be used.
The velocities are constant, let's use the uniform motion relation.
v = [tex]\frac{d}{t}[/tex]
In the attached we have a diagram of the movement. Let's calculate the time to cross the river.
[tex]v_r = \frac{x}{t}[/tex]
[tex]t= \frac{x}{v_r}[/tex]
t = [tex]\frac{120}{8.0}[/tex]
t = 15 s
The time is a scalar it is the same for the two movements, let's find how much it has descended in this time.
[tex]v_m = \frac{d}{t}[/tex]
d = [tex]v_m t[/tex]
d = 12.0 15
d = 180 m
In conclusion, using the uniform motion relationship we can find the result for the distance that descended when crossing the river is:
d = 180 m
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Related Questions
Why is water not used as a liquid in glass thermometers?
Answers
Explanation:
Because water has no uniform rate of expansion and it vaporizes easy when temperature increases that makes it difficult to read.
I NEED HELP I AM SO CONFUSED, WILL GIVE BRAIN.
A man is on a 30m cliff and throws a ball down with a speed of 7 m/s.
A) With what velocity does the ball hit the ground? B) How high above the ground is the ball after the ball has fallen for 1 second?
Answers
Answer:
210
Explanation:
A ball rolls horizontally off the cliff at a speed of 30 m/s. It takes 7 seconds for the ball to hit the ground. What is the height of the cliff and the horizontal distance traveled by the ball?
S = (1/2)*9.8 m/s^2 * 7^2 = 240.1 m if the ball is very dense so air resistance, and therefore terminal velocity, can be ignored.
S = v * t = 30 m/s * 7 s = 210 m for the horizontal distance, again assuming negligible air resistance.
Height above the ground is the ball after the ball has fallen for 1 second is 210 m.
What is speed?The speed of an object is the magnitude of the change of its position over time or the magnitude of the change of its position per unit of time; it is thus a scalar quantity.
A ball rolls horizontally off the cliff at a speed of 30 m/s. It takes 7 seconds for the ball to hit the ground.
S = (1/2)*9.8 m/s² * 7² = 240.1 m if the ball is very dense so air resistance, and therefore terminal velocity, can be ignored.
S = v * t = 30 m/s * 7 s = 210 m for the horizontal distance, again assuming negligible air resistance.
Height above the ground is the ball after the ball has fallen for 1 second is 210 m.
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Which is likely TRUE of an individual whose body composition has little fat and is naturally lean?
OPTIONS:
A.
They have a high metabolism.
B.
They have a family history of obesity.
C.
They require less food than most people.
D.
Their body composition will never change.
Answers
Answer:
A
Explanation:
If an individual whose body composition has little fat and is naturally lean then they have a high metabolism, therefore the correct answer is option A.
What is exercise?The advantages of working out vary depending on the type of death a person experiences. Even if a person exercises, excessive sitting can cause a number of illnesses, many of which are fatal. The individual might also engage in mobile activities, in addition, to exercise to improve their fitness.
Any activity that involves bodily motions that increases a person's health, fitness, and well-being while reducing their chance of developing illnesses is considered exercise. It makes it possible for the person to maintain a healthy weight.
Therefore, if an individual whose body composition has little fat and is naturally lean then they have a high metabolism, therefore the correct answer is option A.
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The gravitational potential energy of an object moving on the ground is
Answers
Answer: ΔPEg = mgh
Explanation: Increases in height and the acceleration due to gravity. The gravitational potential energy of an object near Earth's surface is due to its position in the mass-Earth system.
a spacecraft that seems to be motionless in deep space is given some type of quick push. which statement describes what will happen?
Answers
An applied force applied causes a body such as the spacecraft to move. The magnitude of the force determines the change in the velocity
What will happen to the spacecraft is given by option C. from among the possible question options.
C. The spacecraft will begin to move and it will continue moving until it is stopped by an equal and opposite force
Reason:
The possible question options obtained from a similar question includes;
A. The spacecraft will move for some time then stop slowly
B. Air resistance will prevent the spacecraft from moving
C. The spacecraft will begin to move and the motion will continue until a force equal and opposite to the applied force stops it
D. The quick push will not cause the spacecraft to move, as a quick push works on Earth only
The state of the space craft = Motionless
Location of the spacecraft = Deep space
Type of force applied = Quick push
The statement that describes what will happen = Required
Solution;
Let F, represent the force applied, and let Δt be the duration of the applied force, we have;
The impulse of the force, F × Δt = m·(v₂ - v₁)
Where;
m = The mass of the spacecraft
v₁ = The initial velocity of the spacecraft = 0
v₂ = Final velocity of the spacecraft
Plugging in v₁ = 0, gives;
F × Δt = m·v₂
The space craft is given a velocity, v₂, and according to Newton's First Law of Motion, it continues moving in a straight line until another force acts on it
Therefore, the correct option is option C. The spacecraft will begin to move and the motion will continue until it is stopped by an equal and opposite force
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Write down the relation between force pressure and area
Answers
Answer:
Answer: Pressure is directly proportional to force and inversely proportional to area.
Explanation: Pressure is defined as the ratio of force applied to the area of cross section.
Mathematically,
P=\frac{F}{A}P=
A
F
where,
P = Pressure
F = Force applied
A = Area of cross-section
from above it is visible that pressure is directly proportional to the force applied which means that if force increases, pressure increases. It is also inversely proportional to the area of cross-section. So, when area of cross-section increases, pressure decreases.
The units of pressure are N/m^2N/m
2
and S.I. units for this term is Pascal (P).
what produces pressure in a liquid
Answers
Answer:
1. The weight of the column of water above
2. Due to Gravity
(I would say there are two answers for this question)
Explanation:
1.
The pressure in a liquid is due to the weight of the column of water above. Since the particles in a liquid are tightly packed, this pressure acts in all directions. For example, the pressure acting on a dam at the bottom of a reservoir is greater than the pressure acting near the top.
2.
Fluid pressure can be caused by gravity, acceleration, or forces in a closed container. Since a fluid has no definite shape, its pressure applies in all directions. Fluid pressure can also be amplified through hydraulic mechanisms and changes with the velocity of the fluid.
Is this speed, velocity or acceleration
Answers
Answer:
Speed
Explanation:
There is no other information that involves or asks about the velocity or acceleration. Since that rules out two you will be left with one only option.
Newton’s First Law Scenarios
Taking off from an Aircraft Carrier
The airplane accelerates from 0 to 200 mph in 1.5 seconds. Why are rear-facing passengers' feet tied down? What do their eyes feel like?
Car Accident—Car versus Tree
What happens to the driver's body when his car hits the tree at a high speed?
Car Accident: Rear-end collision
What will happen to the stationary driver who is rear-ended? What device protects him?
Football: Helmet-to-Helmet Collision
What happens to the players' brains inside their skulls?
Roller Coaster Ride
Why does your stomach feel so funny when you go down the big hill?
Why do you feel like you will fly out of your seat at the top of a hill when you are going fast?
Teacups at Disneyland
Why do the riders feel squished together if the teacups spin too fast?
Answers
Answer:Newton’s First Law Scenarios
Taking off from an Aircraft Carrier
The airplane accelerates from 0 to 200 mph in 1.5 seconds. Why are rear-facing passengers' feet tied down? What do their eyes feel like?
Because of the speed of the aircraft and how fast its moving
Car Accident—Car versus Tree
What happens to the driver's body when his car hits the tree at a high speed?
Your body will get slammed forward and into the airbag
Car Accident: Rear-end collision
What will happen to the stationary driver who is rear-ended? What device protects him?
His head will be forced forward that's why they have a airbag and headrests
Football: Helmet-to-Helmet Collision
What happens to the players' brains inside their skulls?
It rattles and thats whats creates a concussion
Roller Coaster Ride
Why does your stomach feel so funny when you go down the big hill?
Because your stomach rises because of the sudden dip
Why do you feel like you will fly out of your seat at the top of a hill when you are going fast?
Because the car has more down force
Teacups at Disneyland
Why do the riders feel squished together if the teacups spin too fast?
Because they are pushed to the outside
Explanation:Newton’s First Law Scenarios
Taking off from an Aircraft Carrier
The airplane accelerates from 0 to 200 mph in 1.5 seconds. Why are rear-facing passengers' feet tied down? What do their eyes feel like?
Because of the speed of the aircraft and how fast its moving
Car Accident—Car versus Tree
What happens to the driver's body when his car hits the tree at a high speed?
Your body will get slammed forward and into the airbag
Car Accident: Rear-end collision
What will happen to the stationary driver who is rear-ended? What device protects him?
His head will be forced forward that's why they have a airbag and headrests
Football: Helmet-to-Helmet Collision
What happens to the players' brains inside their skulls?
It rattles and thats whats creates a concussion
Roller Coaster Ride
Why does your stomach feel so funny when you go down the big hill?
Because your stomach rises because of the sudden dip
Why do you feel like you will fly out of your seat at the top of a hill when you are going fast?
Because the car has more down force
Teacups at Disneyland
Why do the riders feel squished together if the teacups spin too fast?
Because they are pushed to the outside
Please answer this
knvijhbuehguqehguhgnghjnguhsgi0jrgij
Answers
Answer: The correct answer is c
Explanation: When heat radiates it is showing moisture and mixed ways they combine
Answer:
the answer is c trust me bruv
Explanation: im smart
please help me i’m stuck on this question
Answers
2
Which graph represents the motion of a car that is travelling along a straight road with a uniformly
increasing speed?
A
B.
С
D
o acceleration
acceleration
o displacement
o displacement
Tannie
tume
Answers
Answer:
I know someone that has the answer
Explanation:
A
PLS HELP 15 PNTS AND BRAINLSIT FOR CORRECT ASNWER PLSSSS HELP MEEE
Answers
What happens when equal forces
are exerted in opposite directions
(the same amount of push and
pull)?
A. There is positive net force.
B. There is negative net force.
C. The net force is zero.
D. There is a small net force.
Answers
Answer:
B I'm Pretty Sure :DDD
Explanation:
Balanced Forces
In one of your situations in the last section, you pushed or pulled on an object from opposite directions but with the same force. You observed that the object did not move. When the forces on an object are equal and in opposite directions, the forces are balanced, and there is no change in motion.
Are you an antisocial person. Me honestly am
Answers
Explanation:
By the way.. What's the meaning of ANTISOCIAL??..(ㆁωㆁ)
If you tell me the meaning of it, I'll tell you my answer too(ㆁωㆁ)
for an object to be in static equilibrium, the net force must be equal to zero and
Answers
Answer:
The normal force must equal the weight.
Explanation:
Hope this helps..
Clyde takes a flight from Bellingham to Seattle, which is a distance of 90-miles,
at a constant speed of 180-mi/hr. He then rents a car and drives to a friend's house in Mt.
Vernon at 60-mi/hr. Mt Vernon is 30-miles from Bellingham.
What is trip distance?
Answers
i’m not sure if it’s A or B
Answers
Which of the following incorrectly matches the interaction of light with the
motion of a matter?
O vibrational modes are excited by infrared light
rotational modes are excited by radiofrequency
O the nucleus is excited by gamma radiation
O valence electrons are excited by ultraviolet light
Answers
Answer:
b
Explanation:
es
la b
1. Define weight
2. How is the weight of an object related to its mass?
3. If an object has a mass of 50 kg, what is its weight?
4. An object is accelerating when it a speeds up b. slows down c changes direction d any of the above
5. Newton's second law of motion relates an object's acceleration to aits mass b. ils velocity c. the net force acting on it d. a and
6. Doubling the net force acting on an object a doubles its acceleration C. cuts its acceleration in half. b. decreases it acceleration d does not affect its acceleration
7. If the mass of an object doubles, its weight a. doubles b. decreases. c. is not affected. d changes by a factor of
8.If you know the mass of an object, you can calculate its weight with the formula a F-m XV b. a = Fim c. F = m X 9.8 m/s22 d. d = v X 9. Which units can be used to express force? a. N b. kg/s2 c. kgm/s2 d. a ando
10. If you push a 20-kilogram mass with a force of 40 N, what will be the object's acceleration? a 40 m/s2 b. 20 m/s2 c. 10 m/s2 d 2 m/s2
Answers
1. Weight is the gravitational pull with which the earth attracts the body towards the center of the earth. The S.I unit is Newton (N)
2. The weight of an object is related to its mass with the below equation.
W = mg
Where W = weight, m = mass and g = acceleration due to gravity
3. The mass m = 50 kg and g = 9.8 m/[tex]s^{2}[/tex]
Substitute the parameters in the equation above.
W = 50 x 9.8
W = 490 N
4. An object is accelerating when it speeds up. If the object slows down, it means it is decelerating. The correct answer is option A
5. Newton's second law of motion is:
F = ma
Where F = force applied, m = mass and a = acceleration
Therefore, Newton's second law of motion relates an object's acceleration to its net force acting on it. The correct answer is option C
6. According to Newton's second law of motion which relates an object's acceleration to its mass, doubling the net force acting on an object a doubles its acceleration. Because mass is always constant.
7. Since the weight of an object is related to its mass with the equation.
W = mg, If the mass of an object doubles, its weight will also doubles. Option A is the correct answer.
8. If you know the mass of an object, you can calculate its weight with the formula F = mX when X = 9.8m/[tex]s^{2}[/tex]
9. Force is expressed in unit as Newton (N)
10. The parameters given are :
mass m = 20kg
Force F = 40N
To calculate acceleration, use the formula F = ma
Substitute all the parameters into the equation.
40 = 20a
a = 40/20
a = 2m/[tex]s^{2}[/tex]
The correct option is D
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a marble rolls horizontally off a table that is 0.8m tall. if the marble lands 0.6m from the base of the table, what is the initial velocity of the marble?
Answers
The initial velocity of the marble from the given position is 1.49 m/s.
The given parameters;
height of the table, h = 0.8 mhorizontal distance traveled by the train, X = 0.6 mThe time of motion of the marble from the given height is calculated as;
[tex]h = v_yt + \frac{1}{2} gt^2\\\\h = 0 + \frac{1}{2} gt^2\\\\h = \frac{1}{2} gt^2\\\\t = \sqrt{\frac{2h}{g} } \\\\t = \sqrt{\frac{2\times 0.8}{9.8} }\\\\t = 0.404 \ s[/tex]
The initial horizontal velocity of the marble is calculated as follows;
[tex]X = v_0_xt\\\\v_0_x = \frac{X}{t} \\\\v_0_x = \frac{0.6}{0.404} \\\\v_0_x = 1.49 \ m/s[/tex]
Thus, the initial velocity of the marble from the given position is 1.49 m/s.
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The leaves of plants contain specialized parts that absorb energy from sunlight. Which feature would help a plant better compete for sunlight?
leaves that change color
colorful flowers
larger overall leaf size
a shorter stem
Answers
Answer:
In most plants, the leaves are the main food factories. They capture the sun's energy with the help of chlorophyll in the leaf cells. The chlorophyll traps and packages the energy from the light of the sun in a process called photosynthesis. Leaves usually have a large surface so they can collect the most sunlight.
Explanation:
Hope this helps...maybe
Answer:
C
Explanation:
what type of energy results from the burning of wood or gasoline?
Answers
Answer:
Chemical energy
Explanation:
Chemical energy is energy stored in the bonds of atoms and molecules. Batteries, biomass, petroleum, natural gas, and coal are examples of chemical energy. Chemical energy is converted to thermal energy when people burn wood in a fireplace or burn gasoline in a car's engine.
Heavier elements like gold are created in the most massive stars and spread through the universe when these stars explode. This explosion is called a
Answers
Answer:
Big bang
Explanation:
Trust me I know :)
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PLEASE HELP ASAP THANK YOU You're out for run. Your initial velocity is 1.5 m/s. Suddenly a crazy dog starts chasing you and you
accelerate to a velocity of 3 m/s. It takes you 10 seconds to find a safe place to hide from the
Chihuahua. What was your displacement?
Show work
Answers
Answer:
Your displacement would be
s = 22.5 m
s=1/2(v+u)t
plz help me guys thank you
Answers
URGENT: true or false: liquids can be poured from one container to another because there are no attraction forces between atoms or molecules
Answers
Answer:
False
Explanation:
It's common sense
Answer:
True
Explanation:
Water doesnot have any definite shape.There is less attraction between particles .Hence water can move one container to anotherDefine the words offense and defense in flag football
Answers
Answer: I believe offense is the attacking team and defense is the defending team
Source: I just peeked at dad watching football
What needs to be applied in order to change an object's momentum?
a. kinetic energy
b. impulse force
c. a new velocity
d. it’s mass
Answers
Answer:
B
Explanation:
if you want to change an object's momentum you need to apply force to the object
Where on the physical activity pyramid do lifestyle activities belong?
Answers
Answer:
The physical activity pyramid helps in organizing the person's daily life routine. It separated the exercises into different levels and helps the person to inherit a fit and healthy life style.