Mechanics | Relativity Answers

A woman holds a hose 0.8 m above the ground such that the water shoots out horizontally. The water hits the ground at a point 2 m away. What is the speed/velocity with which the water leaves the hose?

A student moves a box of books down the hall by pulling on a rope attached to the box. The student pulls with a force of 176 N at an angle of 24.4◦ above the horizontal. The box has a mass of 33.4 kg, and μk between the box and the floor is 0.22.
The acceleration of gravity is 9.81 m/s2 . Find the acceleration of the box. Answer in units of m/s2

an olympic high jumper leaps over a horizontal bar. the jumper's center of mass is raised 0.25 m during the jump. calculate the minimum speed with which the athlete must leave the ground to perform this feat.

After a day of testing race cars you decide to take your own 1550-kg car onto the test track while moving down the track at 10.0m/s you uniformly accelerate to 30.0m/s in 10.0s what is the average net force that the track has applied to the car during the 10.0s interval

if the density of any substance is 10gm/cm3 , find its relative density

subject .. pressure

If wwe have 2 different cross sectioned tubes filled with with 2 similar liquids with the same density and height , when is the pressure different?

A 50 kg skier is going down a hill sloped at 37 degrees. The coefficient of kinetic friction between the skies and the snow is .15.
A.Calculate the force down the hill.
B.Calculate the Normal force.
C.Find the frictional force.
D.Find the acceleration of skier.
E.How fast in the skier going 5.0 sec after starting from rest?

An engineer weighs a sample of mercury (ρ =
13.6 × 10
3
kg/m3
) and finds that the weight
of the sample is 8.9 N.
What is the sample’s volume? The acceleration of gravity is 9.81 m/s
2
.
Answer in units of m3

A disk and a sphere are released simultaneously at the top of an inclined plane. They roll down without slipping. Which will reach the bottom first?
a. the one of smallest diameter
b. the one of greatest mass
c. the sphere
d. they will reach bottom at same time

The muzzle velocity of an armor-piercing round fired from an M1A1 tank is 1770 m/s (nearly 4000 mph or mach 5.2). A tank is at the top of a cliff and fires a shell horizontally. If the shell lands 6520 m from the base of the cliff, how high is the cliff?