Question 1 An object is released from rest on a planet that has no atmosphere. The object falls freely for 3.0 meters in the first second. What is the magnitude of the acceleration due to gravity on...

Question 1

An object is released from rest on a planet that has no atmosphere. The object falls freely for 3.0 meters in the first second. What is the magnitude of the acceleration due to gravity on the planet?

Question 2

You are on top of a building 45 m high when you toss a ball upward with an initial velocity of 52 m/s. This ball then lands on the roof of an adjacent building which is 150 m high.

• How long will it take for the ball to reach the adjacent roof?

• What will be the velocity of the ball just as it lands on the roof?

  Question 3

  A 4.0 kg mass is initially sitting on the floor when it is lifted onto a table 2.0 meters high at a constant speed.

• How much work will be done in lifting this mass onto the table?

• What will be the gravitational potential energy of this mass, relative to the floor once it is placed

  on the table?

  Question 4

• A sled, which has a mass of 45.0 kg., is sitting on a horizontal surface. A force of 100 N is applied to a rope attached to the front of the sled such that the angle between the front of the sled and the horizontal is 35.0o. As a result of the application of this force the sled is pulled a distance of 500 m at a relatively constant speed. How much work was done to this sled by the applied force?

• A car is sitting at the top of an inclined plane, shown in Figure 1, which is 5.0 m long and meets the horizontal at an angle of XXXXXXXXXXThe cart is then allowed to roll to the bottom of the incline. What will be the velocity of the cart as it reaches the bottom of the incline?

  Question 5

  A rubber stopper, which has a mass of 38.0 grams, is being swung in a horizontal circle which has a radius of 1.30 meters. The rubber stopper is measured to complete 10 revolutions in 8 seconds.

• What is the speed of the rubber stopper?

• How much force must be applied to the string to keep this stopper moving in this circular path at

  a constant speed?

  Question 6

  You have been noisy and unpleasant in a bar and are now in the process of being thrown out by the scruff of the neck by the bouncer. The bouncer has hold of you for 5 secs and you are taken from a seated position to a final speed of 2.75 m/s. If your mass is 70 kg, and assume all motion is in a straight line.

• What was your final momentum?

• What impulse and average force did the bouncer exert on your person?

  Question 7

  A 0.5 kg aluminium frypan on a stove is used to heat 0.250 litres of water from 200C to 800C. How much heat is required? What percentage of the heat is used to raise the temperature of the pan and the water? Use the specific heat values for water is4186 J/kg0C and for aluminium is 900 J/kg0C.

  Question 8

  A battery with a terminal voltage of 9 V is connected to a circuit consisting of four 20 Ω and one 10 Ωresistors all in series. Assume the battery has negligible internal resistance. See Figure 2 below.

• Calculate the equivalent resistance of the circuit.

• Calculate the current through each resistor.

• Calculate the voltage drop across each resistor.

• Determine the total power dissipated by the resistors and the power supplied by the battery.