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After walking across a dry carpet, there's a potential difference of 5500 V between your hand and the doorknob. As you reach toward the knob, a spark jumps, releasing energy 1.0 mJ. a) How much cha
An interesting (but oversimplified) model of an atom pictures an electron "in orbit" around a proton. Suppose this electron is moving in a circular orbit of radius 0.5 nm and the force that makes t
The speed of a transverse wave on a string is 479 m/s, while the wavelength is 0.257 m. The amplitude of the wave is 2.06 mm. How much time is required for a particle of the string to move through a
What is the speed of the electrons emitted by this device? Express this speed as a fraction of c = 3 x 108 m/s. ( In this assignment B=cB which has units of N/C.)
Is the magnitude of the acceleration of the mosquito larger than, smaller than, or equal to the magnitude of the car's acceleration? Explain in complete sentences.
While crossing campus you get your directions mixed up. You start traveling 283 m East; you then travel 135 m traveling 44 North of East; then you travel 313 m West. What is your final distance fro
As two boats approach the marina, the velocity of boat 1 relative to boat 2 is 2.20m/s in a direction 47.0 east of north. If boat 1 has a velocity that is .745m/s due north, what is the velocity (ma
Galileo discovered that something remains unchanged for balls rolling down inclined planes. What remains the same as motion progresses?
A car starts from rest at a stop sign. It accelerates at 2.0 m/s2 for 6.0 seconds, coasts For 2.0 s, and then slows down at a rate of 1.5 m/s2 for the next stop sign. How far apart are the stop signs
Electrons produced by a certain device are observed to travel in a circular path with a radius of 2.0 cm when placed in a uniform magnetic field whose strength is 10 MN/C. What is the speed of the e
Find the net force on the 22 mC point charge. Assume the direction of the x-axis as positive. Express your answer to two significant figures and include the appropriate units.
A free electron and a free proton are exactly 1.3 cm apart. a) Find the magnitude of the acceleration of the proton. Express your answer with the appropriate units.
A room with 3.0 m high ceilings has a metal plate on the floor with V = 0V and a separate metal plate on the ceiling. A 1.0g glass ball charged to +4.9 nC is shot straight up at 5 m/s from the floor
What is the velocity (magnitude and direction counterclockwise from the +x-axis, which is the initial horizontal direction in which the rock was thrown) of the rock just before it hits the ground? F
The speed of a transverse wave on a string is 479 m/s, while the wavelength is 0.257 m. The amplitude of the wave is 2.06 mm. How much time is required for a particle of the string to move through
A sound wave travels from one end of the bar to the other end in 2.52 × 10-4 s. Find the Young's modulus of the unknown material.
A bat emits a sound whose frequency is 90.7 kHz. The speed of sound in air at 20.0 oC is 343 m/s. However, the air temperature is 38.3 oC, so the speed of sound is not 343 m/s. Assume that air behav
The length of the bar is 1.08 m, its cross-sectional area is 1.23 × 10-4 m2, and its mass is 2.96 kg. A sound wave travels from one end of the bar to the other end in 2.52 × 10-4 s. Find t
A hollow, conducting sphere with an outer radius of 0.240 m and an inner radius of 0.203 m has a uniform surface charge density of +6.48×10?6 C/m^2. A charge of -0.790 uC is now introduced in
A soccer player kicks a rock horizontally off a 38.0-m-high cliff into a pool of water. If the player hears the sound of the splash 2.94 s later, what was the initial speed given to the rock? Assum
A diver springs upward with an initial speed of 2.65 m/s from a 3.0-m board. (a) Find the velocity with which he strikes the water.
A point charge of +8.00 uc is located on the x-axis at x= 4.00 m , next to a spherical surface of radius x= 3.00 m centered at the origin. Part A: Calculate the magnitude of the electric field at 3.