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Q. Speakers A and B are vibrating in phase. They are directly facing each other, are 8.0 m apart, and are each playing a 79.0 Hz tone. The speed of sound is 343 m/s. On the line between the speakers there are three points where constructive interference occurs. What are the distances of these three points from speaker A?
Q. A parachutist descending at a speed of 25.0 m/s loses a shoe at an altitude of 50.0 m. (Assume the positive direction is upward.)
(a) When does the shoe reach the ground?
(b) What is the velocity of the shoe just before it hits the ground?
When a train's velocity is 12{rm{ m/s}} eastward, raindrops that are falling vertically with respect to the earth make traces that are inclined 30.0 ^circ to vertical on windows of the train.
You're carrying a 4.0-m-long, 25 poles to a construction site when you choose to stop for a rest. You place one end of the pole on a fence post and hold the other end of the pole 35 from its tip. How much force should you exert to keep pole motionles..
Calculate the magnitude of the electric field at one corner of a square 1.43
A 20.0 kg wood ball hangs from a 1.3 m long wire. The maximum tension the wire can withstand without breaking is 300 N. A 0.70 kg projectile travelling horizontally hits and embeds itself in the wood ball.
A motorcycle daredevil plans to ride up a 2.50m high 25.0° ramp, sail across a 10-m-wide pool filled with hungry crocodiles, and land at ground level on the other side.
The magnitude of the force of friction acting on the block between A and is 1.2N and points A and B are 0.5 m apart. If the kinectic energies of the block at A and B are 4J and 5.6 J, respectively, how much work is done on the block by the force p..
An ideal monatomic gas expands adiabatically from an initial temperature of 368 K and volume of 4.6 m3 to a final volume of 11 m3. If the initial pressure is 1.5 multiplied by Patm, how much work is completed on the gas.
Conclude the electric field at the origin
A 60kg pole vaulter running at 13m/s vaults over the bar. Her speed when she is above the bar is 0.7m/s. Neglect air resistance, as well as any energy absorbed by pole, and determine her altitude as she crosses the bar.
Light of intensity 2.5W/m2 passes through the pupil of one of your eyes and eventually falls on your retina. The radius of the pupil is controlled by the iris.
Compute the camels eastward displacement
A lead fishing weight with a mass of 57.0g absorbs 146cal of heat. If its primary temperature is 50 C, what is its final temperature.
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