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This second sphere is held fixed. If the spheres are initially a large distance apart, how close do they get to each other? Treat the spheres as point charges.
A wire stretches from the top of a building to the ground 8.5 m from the building. If the wire is 11.2 m long, what is the angle formed between the wire and the ground?
A stone is dropped into a well 45 m deep. The sound of the splash is heard 3.13 seconds after the stone is dropped. Find the speed of sound in Air. Take g=10 m/s.
Flywheels are large, massive wheels used to store energy. They can be spun up slowly, then the wheel's energy can be released quickly to accomplish a task that demands high power. An industrial flyw
A dish of hot food has an emissivity of 0.4 and emits 20 W of thermal radiation. If you wrap it in aluminum foil, which has an emissivity of 0.08, how much power will it radiate?
if two waves with equal amplitudes and wavelengths travel through a medium in such a way that a particlar partical of the medium is at the crest of one wave and at the trough of the other wave at th
A 24.0 kg beam is attached to a wall with a hinge and its far end is supported by a cable. The angle between the beam and the cable is 90o. If the beam is inclined at an angle of q = 29.4° with
When the mixture reaches thermal equilibrium, it is at a temperature 24.0°C. If heat transfer to the walls of the calorimeter is negligible, what is the specific heat of the material?
An engine is being used to raise a 55-kg crate vertically upward. If the power output of the engine is 1080 W, how long does it take the engine to lift the crate a vertical distance of 19.8 m? Fric
A third charge of 54.0 nC is placed at the point A, 0.18 m to the left of q2. Find the work needed to move the third charge to point B, 0.40 m to the left of q1.
A spring has a spring constant of 30 N/m. How much work is required to stretch the spring 2.0 cm from its equilibrium position?
A 43-N crate is suspended from the left end of a plank. The plank weighs 21 N, but it is not uniform, so its center of gravity does not lie halfway between the two ends. The system is balanced by a
A 82-kg parachutist descends through a vertical height of 410 m with constant speed. Find the increase in entropy produced by the parachutist, assuming the air temperature is 21° C.
A boy riding on the back of the truck throws a can of soda upward and catches the projectile at the same location on the truck bed, but 12.0 m farther down the road. In the frame of reference
A hydraulic lift has pistons with areas 0.65 m^2 and 5.80 m^2, and they're at the same height.With a 1.9 kN force on the smaller piston, how much mass can the larger piston support?
What is the period of oscillation of the scale? Express your answer numerically in seconds.
A uniform rod with length L = 1.2 m and mass M = 3.3 kg. What is the magnitude of the gravitational force on the particle from the rod?
What is the force to the nearest tenth of a mN on a charge q = 0.71 μC at the point p a distance of r = 0.29 meters?
Our Sun rotates about the center of the Galaxy at a distance of about light-years . What is the period of our orbital motion about the center of the Galaxy in Earth years?
Suppose that 1000 pollen grains slam into the abdomen of a 5.0 bee that is hovering just above the flower. The grain's mass is . If the collision is inelastic, what is the bee's speed immediately af
A tuning fork vibrating at 512 Hz falls from rest and accelerates at 9.8 m/s2. How far below the point of release is the tuning fork when waves of frequency 485 Hz reach the release point? Take the
An object of mass 4kg moving at 5m per seconds was brought to rest over a distance of 2.8m what is the magnitude of the force that brought the object to rest.
When the generator is directed downward, an echo reflected from the ocean floor is received 10.1 s later. How deep is the ocean at that point? (Assume that wavelength is constant at all depths.)
500 J of work are done to compress the gas while, in the same process, 1500 J of heat energy are transferred from the gas to the environment. Afterward, what is the rms speed of the molecules?
It takes 132 J of work to move 1.8 C of charge from a positive plate to a negative plate. What voltage di?erence exists between the plates? Answer in units of V.