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Billy is running on level ground with a speed of 3.5 m/s. He attempts to jump a ditch that is 1.5 meters wide. if the horizontal component of his velocity does not chance, determine the minimum vertical component of velocity when he jumps if the ground on the other side of the ditch is:
A. level with his launch point
B. 0.5 m above his launch point
C. 0.5 m below his launch point
It has been suggested that rotating cylinders about 12 mi long and 5.1 mi in diameter be placed in space and used as colonies. What angular speed should such a cylinder have so that the centripetal acceleration at its surface equals free-fall acce..
Certain rifles can fire a bullet with a speed of 950 m/s just as it leaves the muzzle (this speed is called the muzzle velocity). What is the acceleration of the bullet within the rifle
A spherical Balloon is inflated at the rate of 144pie cubic inches per minute (in^3/min). How fast is the radius of the balloon changing when the radius is 4 inches? Recall the formula for volume of sphere: V(4/3) pieR^3?
zorch, an arch enemy of superman, decides to slow earth's rotation to once per 27.0 h by exerting an opposing force at, How long must zorch push with this force to achieve his goal
A 1.90 kg ball is attached to the bottom end of a length of fishline with a breaking strength of 10 lb (44.5 N). At what angle (measured from the vertical) will the fishline break
Calculate the wavelength of light in vacuum that has a frequency of 7.8 108 Hz. and What is its wavelength in carbon tetrachloride
A 37-kg girl is bouncing on a trampoline. All through a certain interval after she leaves the surface of the trampoline, her kinetic energy decreases to 215 J from 430 J. How high does she rise during this interval? Avoid air resistance.
Suppose that the sound level of a conversation is initially at an angry 70 dB and then drops to a soothing 50 dB. determine the final sound wave amplitudes
An electron is placed in a uniform electric field of strength 210 N/C. If the electron is at rest at the origin of a coordinate system at t = 0 and the electric field is in the positive x-direction
If the greatest pressure crustal rock can sustain before crumbling is 1.4×109 , find the maximum depth of the Earth's crust
When at cruising altitude, a typical airplane cabin will have an air pressure equivalent to an altitude of about 2510 m. During the flight, what is the net force on one ear drum due to this pressure difference
An insulating rod of length 14.0 cm is bent into the shape of a semicircle and has a uniform total charge of -7.5 uC, Calculate the magnitude and direction of the electric field at the center of the semicircle arc
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