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a. Find the angle of a 1.5 m long frictionless ramp with the horizontal ground if a cube with a mass of 8kg is released from the top and has a velocity of 2.50 m/s at the bottom of the ramp.
b. What would the velocity be at the bottom of the ramp if there was a frictional force of 5.00 N in the opposite direction of the cubes path.
A siren has a frequency of 875 Hz when it and an observer are both at rest. The observer then starts to move and finds that the frequency he hears is 1251 Hz. What is the speed of the observer
A park merry-go-round consists of a 220 kg circular wooden platform 4.10 m in diameter. What is the kinetic energy of the merry-go-round
vector a points in the negative y direction and has a magnitude of 4 units. vector b has three times the magnitude and
In a tennis serve, a 0.070 kg ball can be accelerated from rest to 36 m/s over a distance of 0.75 m. Find the magnitude of the average force exerted by the racket on the ball
A 400lb woman stands on a floor in flat soled shoes. Which person is more likely to dent the floor
An "energy bar" contains 21g of carbohydrates. If the energy bar was his only fuel, how far could a 68 kg person walk at 5km/hr? Express your answer using two significant figures.
A wind turbine turns an electrical generator that contains a wire coil with 36 loops and a loop area of 0.10 m2. what is the rms amplitude of the AC voltage produced by the generator
An arrow is launched vertically upward from a crossbow at 97.9 m/s. Ignoring air friction, what is its instantaneous speed at the end of 10.0 s of flight? What is its average speed up to that moment? How high has it risen? What is its instantaneou..
A photon of red light (wavelength = 720 nm) and a Ping-Pong ball (mass = 2.00 × 10-3 kg) have the same momentum
suppose that they have same internal energy, which will have a higher temperature: a metal knife in thermal equilibrim with a hot griddle or a 1kg block of ice at -25C or seven 12g ice cubes at -25C.
q1. a 2.75-mm-tall object is 8.0 cm to the left of a convex lens of 5.7 cm focal length. find the image position and
The mass of a roller-coaster car, including its passengers, is 495kg. Its speed at the bottom of the track in the figure below is 17.00 m/s. The radius of this section of track is r1 = 26 m. Find the force that a seat in the roller-coaster car exerts..
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