A 1.5 kg hockey puck initially moving at 4.9 m/s slides 12 m along the ice before coming to rest.  How much work is done by friction? a) -3.24 J b) -18 J c) -21.1 J d) -31.7 J With ice, the coefficient of static friction may be zero.

A 1350-kg car is traveling with an initial speed of 25.0 m/s. Determine the car's speed after -2.20 × 10° J of net work is done on the car. X m/s

Dr. B is bouncing a 0.245 kg playground ball in his office one day. He drops the ball from a height of 1.2 m, but the ball only bounces up to 70% its initial height. How much work does the floor do on  the ball? a. -1.04 J b. -0.86 J c. -0.69 J d. -0.43 J e. -1.21 J

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Your answer is partially correct. A floating ice block is pushed through a displacement d 27.0 m Ji - (24.0 m )j along a straight embankment by rushing (298 N )i – (183 N ) water, which exerts a force on the block. How much work does the force do on the block during the displacement? Number i 3654 Units

% Consider a situation where you carry a 20-N box up a flight of stairs, raising its elevation by 5 m. 5 The work you do is 4 J. 15 True O False O Bi 89 6 X 7 18 ASUS 8 A 19 9 f10 fll f12 pau bre

7. A student in a lab exerts a 25 N force to pull a block a distance of 48 cm. If a total of 11 J of work is done, the angle between the force and the displacement is a. 89° b. 66° d. 24° e. none of the above c. 61° 8. A 102-g sparrow flying at 12.3 m/s wishes to have equal kinetic and gravitational potential energies. The height that will accomplish this is a. 0.315 m b. 0.628 m d. 1.13 m e. 7.72 m c. 0.787 m 9. Earth's mass is 5.98 x 1024 kg. Calculate the value of g at a point 4.8 x 105 km from the centre of Earth. a. 9.8 × 102 N/kg b. 8.3 x 10' N/kg C. 1.7 × 103 N/kg d. 1.7 x 10³ N/kg e. 9.8 × 105 N/kg 10. A piece of paper becomes electrically charged when a charged rod of plastic is placed close to it. This is referred to as a. charging by a conductor b. charging by induction c. charging by an insulator A P d. charging by contact e. charging by electricity 20 cm Ꭰ T 20 cm 11. Four charged spheres, A, D, P, and T are arranged as shown below. Sphere A has a charge of +4.5 × 10*C,…

11. How much work does Amanda's car experience compared to Bertha's? Amanda and Bertha are in a car race. Their cars have the same mass. At one point in the race, they both change their speeds by 10 m/s in 2 seconds. Ignore air friction. 2s later 2s later 10 m/s 20 m/s 20 m/s 30 m/s Amanda Bertha a. Amanda's car experiences less work b. Amanda's and Bertha's car experience the same amount of work c. Amanda's car experiences more work. O d. Only Rihanna would know. (Work Work Work Work Work...) 96 alt

9. A person pulls a crate across a floor using a rope. They pull on the rope with a force of 95 N at an angle of 35°, and they move the box a distance of 11 m. How much work did they do? e CODE===4 F cos 0= F

At point B, a 240.0 kg roller coaster car is moving at 22 m/s. Assuming there is friction from points D to E, calculate the work done to bring the roller coaster to rest at point E. yo 30 m Ve da 20 m yo" Dm O-1.1 x 10^5 J O-4.7x10^4 J O-5.8 x 10^4 J O1.4 x 10^7 J -6.8 x 10^5 J