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A 523 N physics student stands on a bathroom scale in an 854 kg (including the student) elevator that is supported by a cable. As the elevator starts moving, the scale reads 444 N? Find the magnitu
A small ball of mass 37 g is suspended from a string of length 71 cm and whirled in a circle lying in the horizontal plane. If the string makes an angle of 22? with the vertical, find the centripeta
If each battery can deliver a total charge of 121A.h before recharging, what total charge can be delivered by the 8 batteries before charging, answer in MC.
A grating has 966 lines per centimeter. Find the angles of the first three principal maxima above the central fringe when this grating is illuminated with 560 nm light.
A thin, circular hoop with a radius of 0.22 is hanging from its rim on a nail. When pulled to the side and released, the hoop swings back and forth as a physical pendulum.
Find the child's speed at the lowest position. if the actual speed of the child at the lowest position is 2 m/s, what is the mechanical energy lost due to friction?
A 23- bullet traveling 265 penetrates a 3.4 block of wood and emerges cleanly at 185 . If the block is stationary on a frictionless surface when hit, how fast does it move after the bullet emerges?
What must be the power of the electric motor if the car is to travel at a speed of 66 km/h? Answer in units of kW.
A 64-kg skier is going down a slope oriented 33° above the horizontal. The area of each ski in contact with the snow is 0.13 m2. Determine the pressure that each ski exerts on the snow.
You are a bungee jumping fanatic and want to be the first bungee jumper on Jupiter. The length of your bungee cord is 45.0 m. Freefall acceleration on Jupiter is 23.1 m/s2. What is the ratio of you
A certain freely falling object requires 1.15 s to travel the last 37.0 m before it hits the ground. From what height above the ground did object fall?
An orienter runs the following course: 100 m at 35 degrees, 150 m at 220 degrees, and 50 meters at 170 degrees. Determine the resultant displacement.
Ann is driving down a street at 55.0 km/h. Suddenly a child runs into the street. If it takes Ann 0.75 s to react and apply the brakes, how many meters will she have moved before she begins to slow
If his hand is 0.350 m from his shoulder, on the other end of the stick, what is the magnitude of the downward force the boy exerts with his hand?
At a height of 20 meters above the surface of a lake, a sound pulse is generated. The echo from the bottom of the lake returns to the point of origin 0.160 s later. The air and water temperatures ar
From what height did the student fall? Assume that the only force acting on him during the collision is that due to the ground.
Two charged bodies exert a force of 0.610 N on each other. If they are moved so that they are one-fourth as far apart, what force is exerted?
A proton in a high-energy accelerator is given a kinetic energy of 86.2 GeV.
The diffraction pattern displays a fourth-order maximum where the third minimum of light of an unknown wavelength had been observed to fall. What is the unknown wavelength?
A 2.19 kg block initially at rest is pulled to the right along a horizontal surface by a constant, horizontal force of 16.1 N. The coefficient of kinetic friction is 0.145. The acceleration of gravi
Two free particles (that is, free to move) with charges +q and +4q are a distance L apart. A third charge is placed so that the entire system is in ?quilibrium. Find the location, magnitude, and si
An inductor is hooked up to an AC voltage source. The voltage source has EMF and frequency. The current amplitude in the inductor is .What is the reactance of the inductor?
A 20 g rifle bullet traveling 225 m/s buries itself in a 3.6 kg pendulum hanging on a 2.8 m long string, which makes the pendulum swing upward in an arc. Determine the vertical and horizontal compo
A 2.0cm*2.0cm parallel-plate capacitor has a 2.0mm spacing. The electric field strength inside the capacitor is 1.0*10^5 V/m. what is the potential difference across the capacitor?
A rocket of total mass 3370 is traveling in outer space with a velocity of 123 . To alter its course by 21.0, its rockets can be fired briefly in a direction perpendicular to its original motion. I