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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.
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
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.
(a) Calculate the average velocity of this particle between t = 5 seconds and t = 6 seconds. (b) At what time during this interval is the average velocity equal to the instantaneous velocity?
To start an avalanche on a mountain slope, an artillery shell is fired with an initial velocity of 310 m/s at 49.0° above the horizontal. It explodes on the mountainside 35.0 s after firing. Wha
A soccer ball is kicked from the ground with an initial speed of 21.0 m/s at an upward angle of 45°. A player 58.0 m away in the direction of the kick starts running to meet the ball at that ins
The index of refraction for violet light in silica flint glass is 1.66 and that for red light is 1.62. What is the angular dispersion of visible light passing through an equilateral prism of apex an
A laser beam is incident at an angle of 28.2° to the vertical onto a solution of corn syrup in water. (a) If the beam is refracted to 19.04° to the vertical, what is the index of refraction of
The plane decelerates through the intersection at a rate of 6.40 m/s2 and clears it with a final speed of 41.2 m/s. How much time is needed for the plane to clear the intersection?
An underwater scuba diver sees the Sun at an apparent angle of 47.0° from the vertical. What is actual direction of the Sun?
What is the total charge on the ‘heads' face of the silver dollar? Since the silver dollar is a U.S. coin, its dimensions are in imperial units with a diameter of d=1.5 inches