A 23 {\rm kg} kg child goes down a straight slide inclined 38{\rm ^\circ} above horizontal. The child is acted on by his weight, the normal force from the slide, kinetic friction, and a horizontal rope exerting a 30 {\rm N} force as shown in the figure. How large is the normal force of the slide...

a robot probe drops a camera off the rim of a 338 m high cliff on mars, where the free-fall acceleration is 3.7 meters per second ^2. Find the velocity with which it hits the ground. answer in units of m/s

The pilot of an airplane traveling 250 km/h wants to drop supplies to flood victims isolated on a patch of land 170 m below. The supplies should be dropped how many seconds before the plane is directly overhead?

if you walk along a log floating on a lake,why does the log moving in opposite direction?

A jetliner can fly 5.00 hours on a full load of fuel. Without any wind it flies at a speed of 2.20 102 m/s. The plane is to make a round-trip by heading due west for a certain distance, turning around, and then heading due east for the return trip. During the entire flight, however, the plane...

The cannonball is fired at a speed of 44 m/s and at an angle of 35 . A cannonball that was accidentally dropped hits the moat below in 1.7 s. How far from the castle does the cannonball hit the ground? What is the ball's maximum height above the ground?

An electric fan goes from rest to 2500 in 4.3 .What is its angular acceleration?

Coherent monochromatic light of wavelength passes through a pair of slits separated by distance d, to produce a pattern of maxima and minima a distance L away from the slits. What would cause the separation between adjacent minima to decrease? Decreasing the screen distance L. Decreasing...

Consider a Young's two-slit experiment in which the wavelength of light is 48% smaller than the distance between the slits. A) How many complete dark fringes would be seen on a distant screen? (Assume for all these questions that the screen is as large as it needs to be.) B) How many...

The diagram below shows the wave crests for two sources that are totally in phase. For each of the labeled points, determine whether the light intensity (not the wave amplitude) is a minimum or a maximum, or neither.. A B C