Answer:
80 n
Explanation:
If a central air conditioner (at its highest wattage) runs for 8 hours, how much energy is used?
A)4 kwh
B)8 kwh
C) 32 kwh
D)60 kwh
The central air conditioner's energy consumption while it operates at its maximum wattage for 8 hours: 40 kWh.
If a central air conditioner (at its highest wattage) runs for 8 hours, how much energy is used?We need to know the air conditioner's power usage in watts (W) and how long it runs for in hours in order to determine the energy it consumes (h). Calculating energy usage uses the following formula:
Power (W) x Time (h) / 1000 = Energy (kWh)
We can determine the energy usage as follows if we assume that the air conditioner uses 5000 watts (5 kW) of power at its peak wattage for 8 hours:
Power (W) x Time (h) / 1000 = Energy (kWh)
Energy (kWh) = 5000 W x 8 hours / 1,000
Energy is equal to 40 kWh.
Consequently, choice D corresponds to the central air conditioner's energy consumption while it operates at its maximum wattage for 8 hours: 40 kWh.
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A 57.0-g tennis ball is traveling straight at a player at 21.6 m/s. The player volleys the ball straight back at 24.7 m/s. (a) What is the magnitude of the ball's change of momentum?
P = p2 - p1 = (1.410 k g/s) - (1.234 k g/s) = 0.176 k g/s is the magnitude of ball's momentum shift. The ball's acceleration shift is therefore 0.176 kg/m/s in size.
How does magnitude work?An average man would have given up due of the task's size. earth sciences. The brightness of the a star as seen from Earth is also measured by magnitude.
What unit is magnitude expressed in?Whole numbers & decimal fractions are used to express magnitude. A moderate earthquake of magnitude 5.3, for instance, and a strong earthquake of magnitude 6.3. Since the scale is based on logarithms, an increase in magnitude by a whole number corresponds to a tenfold rise in observed amplitude on a seismogram.
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. "No matter where the object is kept, a diverging lens always forms a virtual image" Do you agree? Give reasons.
I'm sorry, but I must correct the statement as it is not entirely true. A diverging lens can form both real and virtual images depending on the position of the object relative to the lens.
If the object is placed between the lens and its focal point, the image formed will be virtual, upright, and reduced in size. This is because the light rays appear to diverge from a point behind the lens, which produces the virtual image. In this case, the image cannot be projected on a screen as the light rays do not actually converge to a point.
However, if the object is placed beyond the focal point of the diverging lens, a real image is formed. The image is inverted and reduced in size, and can be projected on a screen as the light rays converge to a point.
Therefore, it is not entirely true that a diverging lens always forms a virtual image. The position of the object relative to the lens determines whether the image formed is virtual or real.
calculate the energy needed to raise the temperature of 0.40kg of water in an aluminium container of mass 0.20kg from 15 degrees to 40 degrees
aluminium shc - 900 j/kg
Answer:
To calculate the energy needed to raise the temperature of the water, we can use the following formula:
Q = m * c * ΔT
where:
Q = energy (in joules)
m = mass (in kilograms)
c = specific heat capacity (in joules per kilogram per degree Celsius)
ΔT = change in temperature (in degrees Celsius)
We are given:
m of water = 0.40 kg
ΔT = (40 - 15) = 25 °C
m of container = 0.20 kg
c of aluminum = 900 J/kg°C
First, we need to calculate the energy needed to raise the temperature of the container:
Q1 = m1 * c1 * ΔT
Q1 = 0.20 kg * 900 J/kg°C * 25 °C
Q1 = 4500 J
Next, we need to calculate the energy needed to raise the temperature of the water:
Q2 = m2 * c2 * ΔT
Q2 = 0.40 kg * 4186 J/kg°C * 25 °C
Q2 = 41860 J
The total energy needed is the sum of Q1 and Q2:
Q = Q1 + Q2
Q = 4500 J + 41860 J
Q = 46360 J
Therefore, the energy needed to raise the temperature of 0.40 kg of water in an aluminium container of mass 0.20 kg from 15 degrees to 40 degrees is 46360 J.
Explanation:
I have been working to figure out this question and am lost. It asks "for what value of x-axle will the two forces provide 1.6 Nm of torque about the axle?"
Hence, 12.484 cm is the length of the axle for which the two forces produce 1.6 Nm of torque.
How can you increase a given lever arm's torque without using additional force?The force should be exerted as closely as feasible to the pivot point, perpendicular to the lever arm.
The torque produced by the two forces about the axle can be computed using the information in the diagram as follows:
Torque = Force x Distance x sin(theta)
Given that the angle is 90 degrees and the force is 10 N, the torque is as follows for the given distance from the axle:
Torque1 = 10 N x (10 cm + Laxle) x sin(90 degrees)
Torque1 = 10 N x (10 cm + Laxle) x 1
Torque1 = 100 N.cm + 10 N.Laxle
With a 30 degree angle and a distance from the axle of 10 cm for the 5 N force, the torque is as follows:
Torque2 = 5 N x 10 cm x sin(30 degrees)
Torque2 = 5 N x 10 cm x 0.5
Torque2 = 25 N.cm
The sum of the torques produced by the two forces represents the overall torque:
Total Torque = Torque1 + Torque2
Total Torque = 100 N.cm + 10 N.Laxle + 25 N.cm
Total Torque = 125 N.cm + 10 N.Laxle
The combined torque produced by the two forces is 1.6 Nm, as stated. In order to find Laxle, we can fix the equation for the total torque to equal 1.6 Nm:
125 N.cm + 10 N.Laxle = 1.6 Nm
125 N.cm + 0.16 N.cm = 10 N.Laxle
124.84 N.cm = 10 N.Laxle
Laxle = 12.484 cm
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define power of a lens. the focal length of a lens is -10 cm. write the nature of the lens and find its power. if an object is placed at a distance of 20cm from the optical centre of this lens, according to the New Cartesian Sign Convention, what will be the sign of magnification in this case
The power of a lens is the degree to which it can converge or diverge light rays and is expressed in dioptres (D).
Lens explained.
The power of a lens is the degree to which it can converge or diverge light rays and is expressed in dioptres (D). It is defined as the reciprocal of the focal length of the lens in meters.
Given that the focal length of the lens is -10 cm, we can convert it to meters by dividing it by 100:
f = -10 cm = -0.1 m
The negative sign indicates that the lens is a diverging lens, also known as a concave lens.
To find the power of the lens:
P = 1/f = 1/(-0.1 m) = -10 D
Therefore, the power of the lens is -10 dioptres.
If an object is placed at a distance of 20 cm from the optical centre of this lens, according to the New Cartesian Sign Convention, the object distance is positive (u = 20 cm). Since the lens is a diverging lens, the image formed will be virtual, erect and smaller than the object. The image distance will be negative (v < 0).
Using the formula for magnification:
m = -v/u
We get:
m = -(-10 cm) / (20 cm) = 0.5
Therefore, the negative sign indicates that the image is inverted, but since it is a virtual image, we say it is erect. The magnitude of magnification is less than 1, which means the image is smaller than the object.
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The mass of the moon is 7.35 × 1022 kg and the mass of the earth is 5.98 × 1024 kg. The average distance between the moon and the earth is 3.84 × 108 m. What is this satelite's speed, in km/s (kilometer per second)? Use G = 6.67 × 10-11 N·m2/kg2.
The speed of the moon is approximately 4.70 km/s.
What is the formula to calculate the gravitational force between two objects?The formula to calculate the gravitational force between two objects is F = G * (m1 * m2) / r^2, where F is the gravitational force, G is the gravitational constant, m1 and m2 are the masses of the two objects, and r is the distance between their centers.
How does the distance between two objects affect the gravitational force between them?The gravitational force between two objects is inversely proportional to the square of the distance between them. This means that as the distance between two objects increases, the gravitational force between them decreases. Conversely, as the distance between two objects decreases, the gravitational force between them increases.
We can use the formula for gravitational force to find the speed of the moon:
F = ma = GMm/r^2
where F is the gravitational force between the moon and the earth, m is the mass of the moon, M is the mass of the earth, r is the distance between them, G is the gravitational constant, and a is the acceleration of the moon.
Solving for a, we get:
a = GM/r^2
Using the given values and converting to km and s units:
a = (6.67 × 10^-11 N·m^2/kg^2) × (5.98 × 10^24 kg) / (3.84 × 10^8 m)^2 = 1.99 × 10^-3 m/s^2
Then, we can use the formula for speed (v) and time (t):
v = at
The time it takes for the moon to orbit the earth once is approximately 27.3 days, or 2.36 × 10^6 s. So, we have:
v = (1.99 × 10^-3 m/s^2) × (2.36 × 10^6 s) = 4.70 × 10^3 m/s
Converting to km/s:
v = 4.70 × 10^3 m/s ÷ 1000 = 4.70 km/s
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A truck covers 40.0 m in 9.15 s while uniformly slowing down to a final velocity of 2.20 m/s.
(b) Find its acceleration.
Incorrect: Your answer is incorrect.
m/s2
Answer:
0.24ms^-2
Explanation:
a=v/t2-t1
a =2.24/9.15
a= 0.24 m/s^-2
An astronaut floating in space is motionless. The astronaut throws a wrench in one direction, propelling her in the opposite direction. Which of the following statements are true? (Choose all that apply.)
The impulse applied to the wrench is equal and opposite to the impulse applied to the astronaut.
What exactly does velocity mean?
The speed at which a body or object is moving determines its direction of motion. Most of the time, speed is a scalar quantity. In essence, velocity is a vector quantity. The rate at which distance changes is what it is. It is the rate at which displacement is changing.
I. The velocities will not be same
II. Initial momentum = final momentum
0 = Momentum of Astronaut + Momentum of Wrench
Momentum of Astronaut = - Momentum of Wrench
so equal and opposite
this statement is correct.
III. Impulse = change in momentum
As momentum is equal and opposite impulse will also be equal and opposite.
This statement is also correct.
the impulse applied to the wrench is equal and opposite to the impulse applied to the astronaut.
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What is electrical energy?
A. The ability to do work.
B. The energy of moving electrons.
C. The energy of electricity.
D. The force of moving atoms.
Answer:
The answer is A( The ability to do work)
or B it's in between those two answers
Draw a ray diagram to locate an image formed by a lens when a object is placed at 2f
The ray diagram of the lens at 2f is shown in the image attached.
What is a ray diagram?
A ray diagram is a diagram used to illustrate the behavior of light as it travels through a system of optical components such as lenses, mirrors, or prisms. The diagram shows the path of light rays from an object, through the optical system, to form an image.
Ray diagrams are commonly used in optics to predict the behavior of light and to design optical systems for various applications, such as telescopes, microscopes, cameras, and eyeglasses.
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A box of mass 32.0 kg slides to the right across a horizontal surface with a coefficient of kinetic friction 0.50 while being pulled horizontally by a 750.0 N force. What is the acceleration of the box? Make sure your answer is in MKS units.
The acceleration of the box when pulled horizontally by a 750.0 N force is a = 2.4 m/s2
The acceleration of the box can be calculated by using the equationa = (F - (μk*M*g))/M,
where
F is the force pulling the box,
μk is the coefficient of kinetic friction,
M is the mass of the box, and
g is the acceleration due to gravity.
In this case,
F = 750N,
μk = 0.50,
M = 32.0 kg, and
g = 9.81 m/s2.
Therefore, the acceleration of the box can be calculated as follows:
a = (750N - (0.50*32.0 kg*9.81 m/s2))/32.0 kg = 2.4 m/s2.
The equation used to calculate the acceleration of the box takes into account the force pulling the box and the frictional force acting against it. The frictional force is determined by the coefficient of kinetic friction, which is a measure of the resistance to motion between two surfaces, and the mass of the box.
The acceleration of the box is also affected by gravity, which is why the acceleration due to gravity is included in the equation. Knowing the force and friction acting on the box, we can calculate the acceleration of the box.
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We build a mount with a convergent lens and an object of size 3 cm and we obtain on a screen an object of size 6 cm. The object is at a distance 10 cm from the convergent lens. How far does the screen need to be placed to make the image clean?
Let distance of screen from lens is V magnification
m = v/u
|m| = h1/h0 = |v|/|u|
6/3 = v/10
v = (6 * 10)/3
v = 20 cm
An object moves from position x = -1.88 m to x = -4.27 m. What is it's displacement?
Answer: Displacement = -2.39 m
Explanation: The displacement of an object is the difference between its final position and its initial position. In this case, the object moved from x = -1.88 m to x = -4.27 m, so its displacement is:
Displacement = Final position - Initial position
Displacement = (-4.27 m) - (-1.88 m)
Displacement = -4.27 m + 1.88 m
Displacement = -2.39 m
Therefore, the displacement of the object is -2.39 m.
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