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# A crate on a ramp will slip if the inclination is 55 degrees.

a.) What is the coefficient of static friction? b.) The block has a mass of 5 kg. What is the force of friction on it before it begins to slip?

# A 100N object is on an incline at 370. The coefficients of static and kinetic friction are both 0.30.

a.) What is the smallest force parallel to the incline needed to keep the object from sliding down? b.) What parallel force is required to keep  the object moving up the incline at a constant...

# A horizontal force pulls a 20 kg box across the floor with constant speed, is .60.

How much work does F do in moving the cart 3.0 m?

# Find the work necessary to run a football 1 lb?

From the 2 m mark to the 52 m mark?

# What is the force due to gravity?

A 10 kg mass on a horizontal friction-free table is accelerated by a string attached to 12 kg mass hanging vertically from a pulley. a) What's the force due to gravity on the 12 kg hanging mass? b)...

# A 400 lb load of bricks is to be lifted to the top of a scaffold 30 feet high.

How much work to lift it?

A person with mass of 55 kg is standing on a scale in an elevator. The elevator is moving up and accelerating at 1.5 m/s^2 for 3 seconds, then continues with constant speed. Find the scale reading...

# A 55 kg box slides across the floor by a force of 25N.

a.) How large a friction force impedes the motion of the box? b.) How large is the normal force?

# A 450 kg fully loaded elevator is moving downward.

The tension in the cable is 3500 N. What is the elevator's acceleration?

# A boy of weight, W, hangs from the center of a clothesline and distorts the line so that it makes 30 degrees angles with the horizontal at each end.

Find the tension in the clothesline in terms of W.

# In shooting an arrow from a bow, an archer holds the bow vertical and pulls back on the arrow with a force of 90 N.

The halves of the string make 35 degrees with the vertical. What is the tension in the string? What is the tension in the string?

# What is its velocity?

A ball is thrown up into the air at an initial velocity of 50.0 m/s. What is its velocity after 2.50 seconds?

# a kayaker can paddle her kayak at a steady 2.5 meters/sec in still water.

She wishes to cross a river that is 2.0 km wide and has a current of 1.5 meters/sec. If the kayaker aims her craft straight across the river, the current will carry her downstream as she paddles across...

# What was his initial speed?

A man jumped horizontally from a window and reached the ground 0.80 s later. If he landed 3.6 m from the base of the building, what was his initial speed? How high was the window above the ground...

# How high is the fort?

A cannon ball leaves a fort with an initial horizontal speed of 1.8*10^2 m/s and strikes a ship in the sea below 7.2 s later. How high is the fort above sea level?

# An object is falling at a rate that is 60% of the acceleration of gravity....

An object is falling at a rate that is 60% of the acceleration of gravity therefore it is pressing down on anything below it with: A> 100% of its mass B> 60% of its mass C>...

# Find its time of flight?

A shell was fired from ground level with an initial speed of 350 m/s at an angle of 30 degrees to the horizontal. Assuming there is no air resistance, calculate:   a) its time of flight; b)...

# Find the bullet's range?

A bullet was fired horizontally from the top of a 150 m tall tower at 280 m/s. Find the bullet's range and time of flight. Determine also its speed on impact with the ground below.

# What was the range?

A projectile is fired with a horizontal speed of 25 m/s from the top of a mountain of height 110 m. What was the range and time of flight of the projectile?