1) With static materials, What happens when you bring each charged plastic strip near the paper pieces? Why does this happen?

2)Draw a free body diagram of the forces acting on the piece of paper.

A submarine is stranded on the bottom of the ocean withitshatch25.0mbelowthesurface.Calculatetheforce needed to open the hatch from the inside ,given it is circular of 3.00×105 N/m2. (a) The water enters a hose with a 3.00-cm inside diameter and rises 2.50 m above the pump. What is its pressure at this point? (b) The hose goes over the foundation wall, losing 0.500 m in height, and widens to4.00cmindiameter.Whatisthepressurenow?Youmay neglect frictional losses in both parts of the problem

Explain, in details, why it is more difficult to observe interference pattern under sunlight than light from a sodium lamp.

What are the types of radiation that form the x-ray energy spectrum?

A driver in a moving car applies the brakes. The car slows to a final speed of 1.50 m/s over a distance of 40.0 m and a time interval of 9.00 s. The acceleration while braking is approximately constant. (a) What is the car's original speed before braking? m/s (b) What is its acceleration during this time? (The car's initial velocity is in the positive direction. Indicate the direction with the sign of your answer.) m/s2

A block with a mass of 2.5kg lies on a surface that is inclined at an angle of, θ=22 , with the horizontal. The coefficient of friction between the block and the surface of the incline is, uk=0.20.

a) Apply Newton’s 2nd Law to determine the acceleration of the block as it slides down the surface.

b) Determine the magnitude of the velocity of the block at the base of the inclined surface if the block starts from rest and moves through a distance of 3.41m from its initial position to the base of the incline.

c) Apply the Work/Energy Theorem to determine the velocity of the block at the base of the inclined surface if the block starts from rest and moves through a distance of 3.41m from its initial position to the base of the incline

Problem 1: The energy E of a particle of mass m moving at speed v is given by: E2 = m2 c4 + p2 c2 (1) p=γmv (2) 1 γ = 1−v2/c2 (3) This means that if something is at rest, it’s energy is mc2. We can define a kinetic energy to be the difference between the total energy of an object given by equation (1) and the rest energy mc2. What would be the kinetic energy of a baseball moving at half the speed of light? Give your answer in Joules but also in tons of TNT equivalent. For context, the worst nuclear weapons are measured in megatons. Do you think we could ever accelerate a baseball to half the speed of light?

Problem 2: As we said in lecture, if you heat something up, it becomes more massive! Imagine you took 1 kg of water and heated it up by 50 deg C. By how much would it’s mass increase because of this heating? You might have to look up the heat capacity of water.

What is the recommended way to decrease airspeed while flying in the region of reverse command?

1. A force of 99N is applied to a 26kg lawnmower at an downward angle of 25 degrees relative to the horizontal. There is essentially no friction due to the wheels. Find the acceleration in the x direction

2. A 6 gram bullet is accelerated from rest to a speed of 261 m/s as it travels 79 cm in a gun barrel. Assuming the acceleration to be constant how large was the acceleting force

3. A 15kg box sits on a level table and a force of 83N is applied downward at an angle of 21 degrees related to the horizontal. If the coefficient of friction is 0.4 find the acceleration in the x direction

4. A 5kg blocks sits on a level table and a string runs over the edge of the table on a pulley to a mass of 6kg. Find the acceleration of the system if the coefficient of friction is 0.1

Measuring Current and Voltage:

Make a circuit consist of a battery and a bulb. Measure and record the voltage across the bulb and the current through the bulb. Now attach another bulb in series. Now record the current through each bulb and the voltage across each bulb.

6- Does the value of the current through each bulb (resistor) remain the same as in the previous setup of a single bulb? Why or why not? Explain in words?

7- Does the value of the current in both bulbs (resistors) is the same or not? Why or why not? Explain in words?

8- If you add the value of the voltage across both bulbs (resistors), is it the same as the voltage (emf) of the battery? Why or why not? Explain in words.

Make a circuit consist of a battery and a bulb. Measure and record the voltage across the bulb and the current through the bulb. Now attach another bulb in parallel. Now record the current through each bulb and the voltage across each bulb.

9- Does the value of the current through each bulb remain the same as in previous setup of a single bulb? Why or why not? Explain in words?

10- Does the value of the voltage across each bulb remain the same as in previous setup of a single bulb? Why or why not? Explain in words?

Two cannons are each loaded with one cannonball. One cannonball has twice the mass, but is fired from has a barrel that is twice the length of the other. Which cannonball, if either, will travel farther? Justify your answer with any necessary equations. Assume each cannon applies the same force, and assume that force is constant until the cannonball exits the barrel.

why is the graph of the force vs position not uniform

Briefly explain why a centrifuge will be needed in order to collect the nanoparticles when using a solution-phase method to synthesize nanoparticles. (Think about gravitational force how centrifuge affects “g”)

1) A ball is kickedfrom the top of a bridge at a height of 50 m (measured from the surface of the water below) with an initial speed of 30 [m/s] at 22 degrees with respect to the x-axis.

a) Determine the time it takes for the ball to reach its maximum height.

b) Determine the maximum height of the ball (measured from the water below)

c) Determine the speed of the ball at its heighest point on its trajectory

d) Determine the time at which the ball lands/.

e) Where does the ball land? [i.e. Calculate its range]

f) Calculate the velocity of the ball just before it lands[both magnitude and direction]

A 133-kg horizontal platform is a uniform disk of radius 1.51 m and can rotate about the vertical axis through its center. A 66.5-kg person stands on the platform at a distance of 1.07 m from the center and a 27.5-kg dog sits on the platform near the person, 1.39 m from the center. Find the moment of inertia of this system, consisting of the platform and its population, with respect to the axis. _____ kg*m^2