Physics Practice Problems Module 1

  1. The driver of a car traveling at 25 m/s needs to quickly reduce the car’s speed to 16 m/s to round a curve in a highway. If the deceleration has a magnitude of 6 m/s, how far does it travel while reducing the speed?
a. 25.25 m         b. 25.75 m        c. 29.25 m         d. 30.75 m

  1. A high jumper leap into the air with an initial speed of 5.8 m/s. how high will she be at the top of her flight ?
a. 1.7 m            1.9 m                c. 2.1 m            2.3 m

  1. An airplane traveling horizontally at 78m/s at an elevation of 210 m drops bales of hay to cows stranded in a snowstorm. At what horizontal distance from the cow should the bales of hay be dropped?
a. 510 m           b. 560 m           c. 610 m            d. 660 m

  1. A skier wishes to build a rope tow to pull her self up a ski hill that is inclined at 150 with the horizontal. Calculate the tension need the rope to the skier’s 54 kg body a 1.2 m/s2 acceleration. Ignore the friction.
a. 202 N            b. 222 N            c. 242 N            d. 262 N

  1. Police investigator observes skid marks 30 m long left by a 1200 kg car. The car skidded to stop on a concrete highway having a coefficient a kinetic friction with the tires of 0.80. Estimate the car’s speed at the beginning of the skid.
a. 17.7 m/s        b. 19.7 m/s       c. 21.7 m/ s       d. 23.7 m/ s

  1. A cement truck full of cement has a mass of 42,000 kg. It travels at the speed of 40 miles per hour. Calculate the truck’s momentum in kg-m/s.
a. 3.9 x 105        b. 4.8 x 105       c. 6.6 105          d. 7.5 105

  1. A golf club strikes a golf ball the club and the ball remains in the contact for 0.6 ms. The 45 gram ball leaves the club with a speed of 75 m/s. calculate the average force of the club to the ball.
a. 5.25 N           b. 6.25 N           c. 7.25 N           d. 8.25 N

  1. A 1000 kg. Car traveling west at the speed of 15 m/s has a head on collision with a 4000 kg truck traveling east at 10 m/s. If the vehicles are locked together after the collision, what is their final velocity?
a. 5 m/s toward east      b. 5 m/s toward east      c. 5 toward west            d. 7.5 toward west

  1. A skater traveling at 4 m/s overtakes a 60-kg skater traveling at 2 m/s in the same direction and collides with him. If the two remains in the contact after the collision, how much kinetic energy is lost?
a. 48 J             b. 124 J            c. 392 J            d. 432 J

  1. A 1- kg ball moving at 5 m/s collides with a 2-kg ball moving in the opposite direction at 4 m/s. if the coefficient of restitution is 0.7, find the velocity of the 1-kg ball after the impact?
a. 1.1 m/s         b. 2.8 m/s         c. 3.5m/s          d. 5.2 m/s

  1. A 400 kg roller coaster car starts 48 m above the ground and is 3 m above the ground at the end of the ride. Calculate the change in the potential energy of the car.
a. –127000 J     b. –150,000 J    c. –176,000 J    d. –210,000 J

  1. A ball dropped on a floor from a height of 1.5m bounces back to a height of 0.85m.What is the coefficient of restitution?
a. 0.5                b. 0.6                c. 0.75              d. 0.8

  1. A man weights 180 lb on the earth surface. What would he weigh at the distance from the center of the earth of 3 times the radius of the earth?
a. 20 lb             b. 60 lb             c. 90 lb             d. 180 lb

  1. A 50 kg mass hangs at the end of the spring. When 20 g more are added to the end of the spring, it stretches 7 cm more. Find the spring constant in N/m.
a. 2.5                b. 2.8                c. 3.5                d. 4.3

  1. 100 g of water is mixed to a 150 g of alcohol whose density is 790 kg/m3. Calculate the specific gravity of the total mixture?
a. 1.862            b. 0.963            c. 0.286            d. 0.862


  1. How much oil at 200oC must be added to 50 g of the same oil at 20oC to heat it to 70oC?
a. 12.39 g         b. 19.23 g         c. 23.91 g         d. 29.12 g

  1. How much heat is required to convert 100 g of ice at –10oC to steam at 130oC under standard atmospheric pressure?
a. 69 kcal          b. 74 kcal          c. 79 kcal          d. 84 kcal

  1. A man standing 3360 ft from a high cliff hits a tree stump with an axe, and hears the faint echo 6.4 later. What is the velocity of sound in the air that day?
a. 1050 fps       b. 1100 fps       c. 1150 fps       d. 1200 fps

  1. A man standing somewhere between two walls of a wide canyon shout hello. If the first echo arrived after an interval of 1.2s while the second arrived 0.6 s later. How wide is the canyon?
a. 127.5 m         b. 255 m           c. 510 m           d. 1020 m

  1. What is the velocity of a jet plane traveling at Mach number 2?
a. 600 m/s         b. 680 m/s        c. 760 m/s         d. 840 m/s

  1. Two point charges are placed on the axis as follows: Charge Q1 =4.0µC is located at x = 0.2 m and charge Q2 = 5.0µC is located at x = -0.3 m. What are the magnitude and direction of the total force exerted by these two charges on a negative point charge Q3=6.0µC that is located at the origin?
a. 2.4N to the right         b. 2.4 N to the left         c. 8.4 N to the right        d. 8.4 N to the left

  1. Four identical charges Q = 5 µC are placed at the corners of a square of side 0.2 m. find the magnitude of the total force exerted on one charge by the other three charges.
a. 2.81 N           b. 5.62 N           c. 7.95 N           d. 10.76 N

  1. Two resistors have a resistance of 25 Ωwhen connected in series and 6Ω when connected in parallel. What is the resistance of the smaller resistor?
a. 5 Ω               b. 7 Ω               c. 8 Ω               d. 10 Ω

  1. How fast does light travel in glass of refractive index 1.5?
a. 2x108m/s       b. 3x108m/s       c. 3.75x108m/s              d. 4.5x108m/s

  1. A beam light enters a lake an angle of incidence of 400. find angle of refraction if the index of refraction of water is 1.33.
a. 27 o               b. 29 o               c. 31 o               d. 33o

  1. A flat bottom swimming pool is 8ft. deep how deep does it appear to be when filled with water whose index of redraction is 4/3?
a. 4 ft               b. 5 ft               c. 6 ft               d. 8 ft

  1. Light incident from water (n=1.33) an angle of Incident of 30o on to the glass (n=1.52). after traveling thru the glass to the opposite parallel side, the light emerge onto the air (n=1.00). What is the angle of refraction with which light is transmitted onto the air at the second surface?
a. 26 o               b. 34 o               c. 42 o               d. 48o

  1. A small object lies 4 cm to the left of the vertex of a concave mirror of radius 12 cm. Find the magnification of the image.
a. 6                   b. -6                 c. 3                   d. -3

  1. An object is 4 cm from a diverging lens whose focal length is 12 cm. Where will be the image?
a. 3cm              b. 6 cm             c. –3 cm           d. –6 cm

  1. Find the focal length of a magnifying glass that produces an erect image magnified 3 times of an object 1.5 cm away.
a. 2.25cm                      b. 4.5 cm                      c. –2.25 cm       d. –4.5 cm
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