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A 23.11 kg child bounces on a pogo stick. The pogo stick has a spring constant 17044 N/m. When the child makes a nice big bounce, she finds that at the bottom of the bounce she is accelerating upwar
A 66.1 kg student is standing atop a spring in an elevator that is accelerating upward at 3 m/s2. The spring constant is 2321 N/m. By how much is the spring compressed?
A satellite of mass 5600 kg orbits the Earth and has a period of 6200 s. A) Determine the radius of its circular orbit.(meters) B) Determine the magnitude of the Earth's gravitational force on the sat
A spring stretches 7.2 cm when a 0.39 kg block is hung from it. If a 0.87 kg block replaces the 0.39 kg block, how far does the spring stretch?
When you push a 1.80- book resting on a tabletop, it takes 1.65 to start the book sliding. What is the frictional force exerted on the book when you push on it with a force of 0.90 ?
How long would a 2.00 kW space heater have to run to put into a kitchen the same amount of heat as a refrigerator (coefficient of performance = 4.00) does when it freezes 2.25 kg of water at 22.0&de
A wire with a length of 2.7 m and a mass of 0.89 kg is in a region of space with a magnetic field of 0.72 T. What is the minimum current needed to levitate the wire?
The intensity of a sound wave is the rate of energy transferred to an area perpendicular to the waves, and is given by the relationship I = P/A. What is true about the power transmitted in a wave if
The higher level has a rough section of length L. After passing this section the block slides head on into a spring. The block momentarily stops after compressing the spring by d. The block initial
A diver jumps from rest at the top of a platform that is h = 8.0 m above the surface of a pool. She penetrates the water to a depth d = 4.5 m before coming to rest again. Her mass is m = 85 kg. Find
The current in the RC circuit is recorded without interruption throughout these discharging and charging steps. schematically show the expected behavior of this current as a function of time.
If the loop of wire carries a current of 10 amperes, what is the magnitude and direction of the net magnetic force on the loop? (Ignore the forces on the straight connecting wires, and the fact that
Using only these data and the values of speed of light c and electronic charge e, find the work function of sodium, and a value for Planck's constant.
What is the total distance travelled by the truck? What is the average velocity of the truck for the motion described?
Determine a potential energy function U(x), using the origin as a reference. Sketch a single graph showing the two curves U and F. Describe the resulting motion of the object in words.
A person with a mass 60.0 kg runs 7.50 m up some stairs, gaining 4.00 m elevation in 3.50 s. (a) Find the power output of the person. (b) Find the time for the same person to carry 10.0 kg up the sa
Find the total distance the block will slide. Describe all of the energy transformations and / or transfers that occur during this event.
The roof is tilted 30.0 deg above horizontal and the edge of the roof is 5.00 m above ground level. Question: find the impact speed of the block.
A 0.15 kg particle moves along an x axis according x(t) = -13 + 2t + 4t2 - 3t3, with x in meters and t in seconds. Give an expression for the (a) x, (b) y and (c) z components of the net force (in N
Four small spheres, each of which can be regarded as a point mass of 0.200 kg, are arranged in a square 0.400 m and connected by extremely light rods. Find the moment of inertia of the system about
Energy is conventionally measured in Calories as well as in joules. One Calorie in nutrition is one kilocalorie, defined as 1 kcal = 4186 J. Metabolizing 1 g of fat can release 9.00 kcal.
A coin is placed 6.32 cm in front of a concave mirror. The mirror produces a real image that has a diameter 3.93 times that of the coin. What is the image distance?
The electromagnetic wave that delivers a cellular phone call to a car has a magnetic field with an rms value of 3.75 times 10-10 T. The wave passes perpendicularly through an open window, the area o
Three persons throw identical rocks with the same speed from a bridge to the water. The first person throws the rock 30 degrees above horizontal, the second one throws it horizontally, and the 3rd o
A girl stands on a rotating merry-go-round, 2.1 m from its center. If the girl has a speed of 2.0 m/s, what is the minimum coefficient of static friction between her feet and the merry-go-round that