- Which Of The Following Calculations Is Affected By Your Choice Of A Reference Point 1 Kinetic Energy Ii Gravitational 1 (15.82 KiB) Viewed 35 times
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Question 14 (1 point) A frictionless cart with a mass of 12.0 kg is rolling at a velocity of 0.960 m/s (N What is the final kinetic energy of the cart if it is acted on by a force of 560 N (N) over a displacement of 2.60 m [N]? 146 J 140 J 162 J Question 15 (1 point) The diagram shows a block that is sliding down a frictionless hill. Diagram is not to scale. 151 J
K₂ Refer to the above diagram to answer this question The above diagram shows a 9.35 kg block sliding down a frictionless hill. At the instant the block passes over a point at the tip of h,, it has a speed of 3.80 m/s and is 4.75 m above the base of the hill. What is the gravitational potential energy at the point at the tip of h, if the speed of the block passing over that point is 8.80 m/s? 141 J 87.9 J 127 J 116 J
Refer to the above diagram to answer this question The pendulum has a length of 1.20 m and a bob of mass 2.50 kg. The pendulum bob is pulled sideways until it is 30.8 an above its rest position. What will be its kinetic energy when it passes through the lowest point of its motion? 2.46 J 7.55 JX 5.92 J 6.04 J 76-peint)
Question 17 (1 point) A 345 W winch motor is used to pull a 575 kg mass up an inclined plane. If the force exerted try the winch to move the mass is 4.50 x10' N. how long will it take the winch to move the mass 25.0 m up the incline? 326 s * 426 s Question 18 (1 point) what is the pinuntor and its occupants have a mass of 1.25 X 10 kg. The elevator motor can lift this load a 298 s 392 s
Question 18 (1 point) An elevator and its occupants have a mass of 1.25 x 10' kg. The elevator motor can lift this load a distance of 42.0 m in 15.0 s. If the motor uses 2.30 X 10° 3 of energy to do this, what is the efficiency of the system? 0.286 O 0.312 0.224 O 0.199 uestion 19 (1 point) tol platform that is rotating with a period of 8.00
UMAR Question 19 (1 point) A 5.00 kg mass is riding on a horizontal platform that is rotating with a period of 8.00 s. The mass is held in place by the friction at a distance of 5.20 m from the centre of rotation. The coefficient of friction between the mass and the platform must be at least (Record your three-digit answer in the answer space.) Question 20 (1 point) A mass of 72.0 kg is travelling at a velocity of 12.8 m/s [E] on a horizontal frictionless surface. It comes to an area of the surface where the coefficient of friction is 0.220. When the mass has moved a distance of 3.74 m into the area, friction acts on the mass so that the kinetic energy of the mass and 10 The values of a b. c. and d, respectively, are
Question 20 (1 point) A mass of 72.0 kg is travelling at a velocity of 12.8 m/s [E] on a horizontal frictionless surface. W comes to an area of the surface where the coefficient of friction is 0.220. When the mass has moved a distance of 3.74 m into the area, friction acts on the mass so that the kinetic energy of the mass becomes a.bcX 10 J. The values of a, b, c, and d, respectively, are and (Record all four digits of your answer in the answer space.)