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Q. An 800-N man stands halfway up a 5.0-m long ladder of negligible weight. The base of the ladder is 3.0m from the wall as shown. Assuming that the wall-ladder contact is frictionless, the wall pushes against the ladder with a force of what magnitude?
Q. Two events in reference frame S occur 10 mus apart at the same point in space. The distance between the two events is 2400 m in reference frame S' .
What is the time interval between the events in reference frame {rm S} ' ?
An alpha particle (m = 6.7 x 10^-27kg, q = +3.2 x 10^-19C) has a speed of 30km/s at point A and moves to point B where it momentarily stops. Only electric forces act on the particle throughout this motion. Find out the electric potential difference.
What is a vertical velocity of the ball
Estimate the change in COP of your electric food freezer when it is removed from your kitchen to its new location in your basement, which is 8 C° cooler than your kitchen. (Assume that the temperature in the kitchen is 20°C and that the temperature o..
How much energy is transferred to the water as heat
A proton starting from rest is accelerated in a cyclotron to a speed of 3.0•106 m/s. Find the work done on a proton by the electrical force of the cyclotron.
How to find out an initial speed of the bullet
A 3.80 m-long, 430 kg steel beam extends horizontally from the point where it has been bolted to the framework of a new building under construction. A 66.0 kg construction worker stands at the far end of the beam. What is the magnitude of torque abou..
A truck covers 40.01 m in 7.615 s while smoothly slowing down to final speed 1.40 m/s. What is the original speed and what is the acceleration.
Hair dryer draws a current of 9.2a. How long does it take 1.9*10^3 C of charge pass through? How many electrons does this represent.
Meanwhile, Isaac is piloting his ship in the westward direction, also at 0.89, toward Albert's ship. With what speed does Isaac see Albert's light beam pass his ship.
If the accelerating plates are 1.60 apart, and have a potential difference of 2.60×10^4, what is the magnitude of the uniform electric field between them.
Angular acceleration and angular displacement of the rotor using the equation of motion in rotational dynamics.
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