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According to the definition of work, the work done by an external force in moving a heavy crate along a horizontal surface should be the same whether the force is pulling upward at a 45 degree angle or pushing downward at a 45 degree angle. In practice it is easier to pull the crate than to push it at 45 degrees. Why is this so?
A 2.00-liter aluminum cylinder at 5°C is filled to the brim with gasoline at the same temperature. If the aluminum and gasoline are warmed to 59°C, how much gasoline spills out.
How to find the magnetic field
At the instant the traffic light turns green, an automobile starts with a constant acceleration a of 2.0 m/s2. How fast will the automobile be traveling at that instant
A sound source emits sounds of frequency 215 Hz that travel through still air at 340 m/s. Find the frequency heard by the listener
A load of weight W is suspended from a cable of length L on a construction vehicle. What is the max angle through which the load swings
A student at the top of a building throws a ball straight upward with an initial speed v0. How do the final velocities of the balls compare when they reach the ground
A spherical balloon of volume 4.03 x10^3 cm3 contains helium at the pressure of 1.15 x10^5 Pa. How various moles of helium are in the balloon if the average kinetic energy of the helium atoms is 3.60 x10-22 J.
A football is kicked 50.4 meters. If the ball is in the air 4.54 s, with what initial velocity was it kicked
Neglect air resistance, as well as any energy absorbed by the pole, and clerify her altitude as she crosses the bar.
An extremely light rod 1.00 m long has a 2.00-kg mass attached to one end and a 3.00-kg mass attached to the other. find the moment of inertia of the system about the fixed axis
A rock is dropped off the side of a bridge and hits the water below 5.7 s later. What was the rock's velocity when it hit the water
A pendulum of length 50cm is pulled 30 cm away from vertical axis and free from rest. What would be its speed at the bottom of its swing.
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