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# Newton's Laws

### Physics of Matter: Pressure produced on the air in a bicycle tire pump

A bicycle tire pump has a piston with area 0.44 in (exponent 2). If a person exerts a force of 30lbs on the piston while inflating a tire, what pressure does this produce on the air in the pump?

### Impulse and average force on the ball during the kick by a soccer player

A ball of mass 0.145kg is kicked by a soccer player. If the player's foot is in contact with the ball for 0.01sec and gives it a speed of 40m/sec, find the impulse and average force on the ball during the kick.

### Force between current carrying conductors

Find the force experienced by each of two long straight parallel conductors of length, L, separated by a distance, d, and carrying currents i1 and i2.

### Two springs have one end fixed on opposite sides of the box

SEE ATTACHMENT #1 for a diagram of initial and final conditions. In a box with vertical sides, two springs have one end fixed on opposite sides of the box. The free ends are distance S= .64 meters apart. When the free ends are pulled together and joined, find the change in the length of each spring. Their force constants

### Reaction Force of a Uniform Ladder

An 8 m long, 12kg, uniform ladder leans against a frictionless wall making an angle of 65 degrees with the floor. A 75 kg person is able to climb to the 7 m mark on the ladder before it slips. What is the reaction force on the ground?

### Calculate the cross-sectional area of the larger cylinder

A 12 pound force can lift a 150 pound force on a hydraulic lift. The smaller of the two cylinders has a cross-sectional area of 20cm^2. Calculate the cross-sectional area of the larger cylinder.

### Fluids: What is the force on the bottom of Archimedes's baththub?

What is the ABSOLUTE pressure on the bottom of Archimede's bathtub if the dimensions of the tub are 3m long by 1.2m wide by 0.8m high? Assume that the tub is filled to the top with water and Archimedes hasn't gotten into the tub yet? What is the force on the bottom of Archimedes's bathtub?

### Calculating the average net force

A 62 kg person, standing on a diving board, dives straight down into the water. Just before striking the water, her speed is 5.50 m/s. At a time of 1.65 s after entering the water, her speed is reduced to 1.10 m/s. What is the average net force (magnitude and direction) that acts on her when she is in the water?

### Finding the horizontal area enclosed by the waterline of a ship.

Suppose one of the navy ships bobs up to float 11cm higher in the water when 50 fighters take off from it in 25 minutes, at a location where g=9.78m/s^2. Bristling with bombs and missiles, the planes have average mass 29000kg. Find the horizontal area enclosed by the waterline of the 4 billion dollar ship. By comparison, its

### Physics Rowboat Mercury Weight Density

You (m=80.0 kg) are in a rowboat (m=40.0 kg) of volume 0.300 m3. To answer the following, use the density of seawater as 10,050 N/m3. Before you step into the rowboat, how much water does the rowboat displace with nothing in it? What is the maximum load (excluding you and the boat) that you can take on before the rowboat sin

### Determine the net force of two opposing forces.

What is the net force acting on the object that has a force of 20.9N 34 degrees West of North and a second force of 34.5N 42 degrees East of North acting on it?