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(1) A small mailbag is released from a helicopter that is descending steadily at 1.50m/s. After 2.00s, (a)what is the speed of the mailbag (b) how far is it below the helicopter? (c) what are your answers in parts (a) and (b) if the helicopter is rising steadily at 1.50m/s.
(2) A bartender slides a beer mug at 1.50m/s towards a customer at the end of a frictionless bar that is 1.20m tall. The customer makes a grab for the mug and misses and the mug sails off to the end of the bar. (a) how far away from the end of the bar does the mug hit the floor. (b) what are the speed and direction of the mug at impact.
(3) A fireman 50.0m away from a burning building directs a stream of water from a ground-level fire hose at angle of 30 degrees above the horizontal. If the speed of the stream as its leaves the hose is 40.0m/s at what height will the stream of water strike the building.
(4) Determine which of the following moving objects obey the equations of projectile motion developed. (a) a ball is thrown in an arbitrary direction. (b) a jet airplane crosses the sky with its engines thrusting the plane forward. (c) a rocket leaves the launch pad. (d) a rocket moves through the sky after its engines have failed. (e) a stone is thrown under water.
if a hydroelectric facility is to produce 100 000 hp with an elevation difference of 300 ft, what is a suitable speed (in rpm) if a kaplan turbine, operating at high efficiency, is used
A 0.140 kg baseball is thrown with a velocity of 40 m/s. It is struck with an average force of 5000.0 N, How long were the bat and ball in contact
The resultant displacement has a magnitude of 6.6m directed at the angle of 137 degrees from the positive x axis.
A camera uses a biconvex lens made of glass with an index of refraction of 1.60 and has a radius of curvature of 12cm for the 1st surface, What is the focal length of this lens when used in air
A roller-coaster car may be represented by a block of mass 50.0kg . The car is released from rest at a height h = 57.0m above the ground and slides along a frictionless track. The car encounters a loop of radius R = 19.0m at ground level, as shown..
By measuring the spectrum of wavelengths of light from our sun, we know that its surface temperature is 5760 K . By measuring the rate at which we receive its energy on earth, we know that it is radiating a total of 3.93×1026 J/s and behaves nearl..
I have a problem in mechanical physics where I'm given the linear mass density of a rigid plastic material. Here's the problem for context: A 42 cm diameter wheel, What is linear mass density
A rattlesnake can strike with the acceleration equivalent to an increase in speed from 0 to 60 mi/h in 1/2 s. If the rattlesnake's head weighs 0.33 lb, what average power does the rattlesnake generate throughout its strike.
A proton moving at 7.00 106 m/s through a magnetic field of magnitude 1.74 T experiences a magnetic force of magnitude 7.40 10-13 N. What is the angle between the proton's velocity and the field
An electron is confined to move in the xy plane in a rectangle whose dimensions are Lx and Ly. That is, the electron is trapped in a two-dimensional potential well having lengths of Lx and Ly. In this situation, the allowed energies of the electron d..
When a certain spring is stretched by an amount x, it produces a restoring force of F(x) = ax=bx^2, where a and b are constants. How much work is done through an external force in stretching the spring by an amount D from its equilibrium length.
a 1000kg car experiences a total power of 150hp (horsepower) if it starts from rest what is the magnitude of the velocity of the car in miles per hour 10s later
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