1. Two skaters, Elena and Tara, face each other on the ice. Elena has a mass of 47.4 kg, and Tara has a mass of 28.3 kg. Both are motionless until they push away with a force of 33 N. Then Elena has a velocity of 1.45m/s. What is Tara’s velocity? (P.6D) ______m/s
  1. A 0.078-kg ball strikes a wall with a velocity of 32.2 m/s. The wall stops the ball in 0.56 s. What force does the wall exert to stop the ball? (P.6C) ______N
  1. A 1000-kg car is moving along a straight highway with a velocity of 78 km/h. The driver applies the brakes and reduces the car’s speed to 36 km/h in 7.5 s. What is the force on the car? (P.6C) ______N
  1. A 1100-kg car is traveling at 25 m/s when it crashes into the rear end of a 1250-kg car traveling at 22 m/s in the same direction on ice. The two cars become stuck together and slide on the ice. How fast do the two cars move together immediately after the collision? (P.6D) ______m/s
  1. The graph shows the force and displacement of an object that is being pushed. How much work is done to push the object 5.0 m? (P.6A) ______J
  1. What is the gravitational potential energy of a 0.25-kg ball resting at the edge of a roof that is 32 m above the ground? (P.6B) ______J
  1. A 14.5-kg rock falls from a cliff at a height of 138 m to a cliff that is 20 m above the ground. How fast is the rock falling when it strikes the lower cliff? (P.6B) ______m/s
  1. A 54-kg snow skier is at the top of a 200-m high hill. After she has gone down a vertical distance of 102 m, what is her mechanical energy? (P.6B) ______J
  1. A 0.50-kg block of copper initially has a temperature of 100.0°C. It is allowed to cool until its temperature is 22.0°C. How much heat did the lead transfer to its surroundings? (P.7E) ______J
  1. Which of three identical water bottles having temperatures of 40C, 43C, and 50C has most molecular KE? (P.6G) ______C
  1. Echoes are caused by the ______of sound waves off hard surfaces. (P.7D)
  1. What is the wavelength of wave 2 in air? (The speed of sound in air is 343 m/s.) (P.7B) ______m
  1. The wavelength of a beam of light passing through a vacuum is 4 x 10-7 m. What is the frequency of the light beam? (P.7B) ______Hz
  1. If a light ray reflects off a plane mirror at an angle of 15° to the normal, what is the angle of incidence of the ray? (P.7D) ______degrees
  1. A glass rod looses electrons when rubbed with silk and becomes ______which attracts silk because the silk becomes ______? (P.5D)
  1. Spheres A and B are located 2.0x10-2 m apart. If sphere A has a charge of -4.0x10-6 C and sphere B has a charge of-3.0x10-6 C, what is the magnitude of the force of sphere B on sphere A? (P.5C) ______N
  1. A 9.0-V battery delivers a 1.1-A current to an electric motor. How much power is delivered to the motor? (P.5F) ______W
  1. If a 9.0-V battery is connected to a circuit with 1.0 A of current, what is the resistance? (P5.F) ______ohms
  1. What is the potential difference, in volts, required to pass a current of 2.0 A through a resistor of 22 Ω (Red Red Black)? (P.5F) ______V

Use the diagram below to answer problems 20 and 21.

  1. The diagram above shows a circuit with two resistors connected in series. What is the total current in the circuit? (P.5F) ______A
  1. What is the voltage drop across the 70.0-Ω resistor in the circuit? (P.5F) ______V
  1. The diagram to the right shows a circuit with three resistors connected in parallel. What is the total current for the circuit? (P.5F) ______A
  1. The equivalent resistance in the circuit to the right is: (P.5F) ______ohms
  1. Similar electric changes ______while different electric charges ______each other? Similar magnetic poles ______while different magnetic poles ______each other(P.5C)
  2. A beam of light has a frequency of 6 x1014 Hz. What is the color of the light? 1 nm = 10-9 m (P.7B, 7C)
  1. A red light wave with a wavelength of 622 x 10-9m is traveling from the Sun to Earth. What is the frequency of the wave? (P.7B, 7C)
  1. Is light a particle with energy or a wave with energy? Explain your answer. ______(P.8A)
  1. A woman presses against a wall with a force of 20 N for 50 seconds. The work she does is:______J (P.6A)
  1. To raise a 475 kg steel beam to a height of 12 m on a bridge being built requires work of: ______J(P.6A)
  1. A weight lifter raises a 175 kg barbell over his head from the floor, a displacement of 1.0 m, in 1.5 s. The average power is:______W (P.6C)
  1. The KE of a 1000 kg car whose velocity is 45 km/hr is: ______J (P.6B)
  1. A 50 kg mass has a PE of 5.3 kJ relative to the ground. The height of the mass above the ground is ______m (P.6B)
  1. How much energy is required to stop a car of mass 100.0 kg moving at a speed of 22.0 m/s? ______J (P.6A)
  1. Which of the following has the greatest kinetic energy, a 33.0-g bullet traveling at 1.50 × 103 m/s, a 33.0-kg cheetah running at 31 m/s, a 330-kg car traveling at 5 m/s, or a 0.30 kg pitched baseball moving at 45 m/s? ______(P.6B)
  1. The focal length of a convex lens is 17 cm. A candle is placed 14 cm in front of the lens. The image is ______and it is oriented ______and it is ______(enlarged or reduced)? (P.7D)
  1. If a 3.0-cm-tall object is placed 20 cm in front of a converging lens a real image is formed 15 cm from the lens. What is the focal length of the lens?______cm(P.7D)
  1. A 30-kg rock is on the edge of a 100-m cliff. What potential energy does the rock possess relative to the base of the cliff? (P.6B) ______J
  1. A 30-kg rock falls straight down off a 100-m cliff. What speed does the rock have as it strikes the ground? ______m/s (P.6B)
  1. Which object in the diagram below has the weakest charge? (P.5D) Answer:______
  1. You need to know the height of a tower, but darkness obscures the ceiling. You note that a pendulum extending from the ceiling almost touches the floor and that its period is 7 s. How tall is the tower? (P.7A)
  1. The electromagnetic interaction affects any subatomic particle that possesses: ______(P.5D)
  1. Magnetic fields are created by the currents in home appliances. Suppose the magnetic field in the vicinity of an electric blow-dryer has a magnitude of about 1.5 × 10−4 T. If a wire 6.5 cm long in such a blow dryer experiences a magnetic force of 1.6 × 10−7 N, what current must exist in the wire? Assume the wire is perpendicular to the field. Current = ______(P.5G)

43. Two very narrow slits are cut close to each other in a large piece of cardboard. They are illuminated by monochromatic red light. A sheet of white paper is placed far from the slits, and a pattern of bright and dark bands is seen on the paper. This is due to.______(P. 7D)

44. Adam, a champion weightlifter, raises 220 kg of weights a distance of 2.0 m. If Adam completes the lift in 2.0 s, how much power is developed? :______W (P.6A)

45. When two ring magnets are placed on a pencil, magnet A remains suspended above magnet B, as shown below. Gravity of magnet B and A is ______while magnetic force is ______between A and B? (P.5G)

46. In which area is the magnetic field the weakest? ______(P.5G)

47. Several compasses are placed around a bar magnet. Which end of the magnet is its south pole? (P. 5D)

Ans: ______

48. Which letter shows where the incoming light ray will go as it passes through the lens? (P.7D)

Ans: ______

49. When nucleons join to form stable nucleus it is called ______and energy is ______. When the nucleons break to release energy it is called ______(P.8C)

50. What is the frequency of a photon with an energy of 1.1 x 10-19 J? (P.8A) f = ______Hz