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A 20kg sled, initially at rest, slides down a hill, which is 20m tall. If the total work done by forces of friction and air resistance (non-conservative forces) is -2500J, what is the speed of the sled at the bottom of the hill?
A 1.2 kg ball drops vertically onto a floor, hitting with a speed of 20 m s-1. It rebounds with a speed of 10 m s-1. What impulse acts on the ball during the contact
A 2.70 bucket is attached to a disk-shaped pulley of radius 0.121 and mass 0.842 . If the bucket is allowed to fall. What is the angular acceleration of the pulley
The rms current in a copy machine is 7.50 A, and the resistance of the machine is 14.4 ?. What is the peak power delivered to the machine?
A 0.230-kg block along a horizontal track has a speed of 1.50 m/s immediately before colliding with a light spring of force constant 48.2 N/m located at the end of the track. What is the spring's maximum compression
One of the concrete pillars that support a house is 2.5-m tall and has a radius of 0.50 m. The density of concrete is about 2.3 x 10^3 kg/m3. Find out weight of this pillar in pounds (1 N = 0.2248 lb)
The small spherical planet called "Glob" has a mass of 6.06×1018 kg and a radius of 5.84×104 m. What was the initial speed of the rock as it left the astronaut's hand? (Glob has no atmosphere, so no energy is lost to air friction
A flywheel comprises a uniform circular disk with a mass of 99.0 kg and a radius of 1.0 m. It rotates with an angular velocity of 1472 rev/min. what is the tangential force
A diver 32.0 m deep in 8.00 °C fresh water exhales a 1 cm diameter bubble. What is the bubble's diameter just as it reaches the surface of the lake, where water temperature is 25°C? Hint: suppose the air bubble is always in thermal equilibrium wit..
A 100-kg object and a 400-kg object are separated by 4.20 m. Find the magnitude of the net gravitational force exerted by these objects on a 64.0-kg object placed midway between them
A charged particle moving with speed, v, enters a region containing a uniform magnetic field, Starting from Newton's second law, derive the formula for the radius of the particle's orbit in terms of its mass, m, speed, v, and the magnetic field, B
An electron is released from rest at the negative plate of a parallel plate capacitor. How fast is the electron moving just before it reaches the positive plate
A typical incandescent lightbulb has a filament temperature of approximately 3191 K. At what wavelength is the intensity of the emitted light highest
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