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A skateboarder shoots off a ramp with a velocity of 7.1 m/s, directed at an angle of 56° above the horizontal. The end of the ramp is 1.5 m above the ground. Let the x axis be parallel to the ground, the +y direction be vertically upward, and take as the origin the point on the ground directly below the top of the ramp. (a) How high above the ground is the highest point that the skateboarder reaches? (b) When the skateboarder reaches the highest point, how far is this point horizontally from the end of the ramp?
question a juvenile elephant has a mass of 300kg. he wishes to fly using his very large ears. if the air speed on top
A strip of paper is pulled along at 20m/s at a right angle to the plane of a .49m long pendulum. The pendulum has a small ink jet device to the bob so that it marks the position of the pendulum on the paper. The bob is held 8.0cm to one side and rele..
Suppose we rely upon friction between the wall and the rod to hold up the sign (there is no hinge attaching the rod to the wall). What is the smallest value of the coefficient of friction
An observer inside the building notices that it takes 0.15s for the tile to pass her window, whose height is 2.20m. How far above the top of this window is the roof.
A wall is composed of two materials. Material 1 has a thickness of3.22 cm and a thermal conductivity of 0.1 while material 2 has athickness of 8.49 cm and a conductivity of 1. If the temperature difference inside to outside is 25 Co and the wall h..
Compute the wavelength of the light emitted by hydrogen as predicted by the Rydberg formula ( 1/λ=R(1/n'2- 1/n2)) with n=4 and n' =3
at time t0 a 2450 kg rocket in outer space fires an engine that exerts an increasing force on it in the x-direction.
In a typical lightning flash, the potential difference between the cloud and the ground is 10^9V and the charge transferred is 30 C. Calculate the final speed of the car
A 0.32 kg body undergoes simple harmonic motion of amplitude 9.1 cm and period 0.40 s. What is the magnitude of the maximum force acting on it
An archeologist on a dig finds a fragment of an ancient basket woven from grass. Calculate the age of the basket
A student uses an audio oscillator of adjustable frequency to measure the depth of a water well. How deep is the well
a block of mass 4kg is suspended from a spring with spring constant 500nm. a bullet weighing 50.0 g is fired into the
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