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A) A spring has a spring stiffness constant k of 100N/m . How much must this spring be compressed to store 35.0J of potential energy?
B) A 69-kg trampoline artist jumps upward from the top of a platform with a vertical speed of 5.2m/s.
How fast is he going as he lands on the trampoline, 2m below?
If the trampoline behaves like a spring of spring constant 7.4x104N/m , how far does he depress it?
C)A ski starts from rest and slides down a 28?incline 55m long.
If the coefficient of friction is 0.090, what is the ski's speed at the base of the incline?
If the snow is level at the foot of the incline and has the same coefficient of friction, how far will the ski travel along the level? Use energy methods.
A typical human body has surface area 1.4 m2 and skin temperature 33 C. If the body's emissivity is about 0.95, what's the net radiation from the body when the ambient temperature is 15C?
Jack and Jill are standing on a crate at rest on the frictionless, horizontal surface of a frozen pond. What is the final speed of the crate if Jack jumps first and then a few seconds later Jill jumps in the same direction
A golfer hits a shot to a green that is elevated 3.0 m above thepoint where the ball is struck. The ball leaves the club at a speedof 18.9 m/s at an angle of 33.0° above the horizontal. It risesto its maximum height and then falls down to the gree..
two resistors have resistances rsmaller and rlarger where rsmaller lt rlarger. when the resistors are connected in
Show how the de Broglie hypothesis for the wavelength of an electron can lead to an explanation of the condition for quantization of orbital angular momentum in the Bohr model for hydrogen atom.
a pendulum of length L = 48.8 cm and mass m=169g is released from rest when the cord makes an angle of 65.4 with the vertical
The brake system on the San Francisco cable car uses a wedge pushed into the cable slot. what is the mechanical advantage of the wedge as a braking machine
the average density of a fish can be found by first weighing it in air and then finding the scale reading for the fish
Three identical point particles that have charge q are at the vertices of an equilateral triangle that is circumscribed by a circle of radius a that lies in the z = 0 plane, What is the electric potential at the origin
An object with a height of 2.23 centimeter is located 37.6 millimeter to the left of a lens with a focal length of 35.0 millimeter. Obtain where is the image located
She fires a very brief blast from her jetpack, which almost immediately gives her a speed of 3.7 m/s horizontally. She swings up along a circle and comes to a stop when her thread makes an angle q relative to the vertical. What is q in degrees?
A 25.0 µF capacitor is charged by a 135.0-Vpower supply, then disconnected from the power and connected in series with a 0.200-mH inductor. Calculate the oscillation frequency of the circuit
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