How much kinetic energy has a 160 g cricket ball when it is thrown at a speed of 22 m/sec? O a. 387.2 J O b. 3872 J
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- A particle of mass m has a velocity of v = (v₂i + vj + v₂k). What is the correct expression for its kinetic energy? O a. O b. O c. O d. O e. m(v2i+vy²j + v₂²k)/2 None of these choices. m(vx2 + Vy² + V₂²)/2 m/2(2vx + 2Vy + 2V₂) m/2(2v,i + 2vj + 2v₂k)1. The sledder shown in figure starts from the top of a frictionless hill (Point A) with an initial speed of 30 m/s and slides down into the valley. What is the final speed at the top of the next hill (Point B)? 30 m/s A 100 m 130 m O 30 m/s We cannot solve this problem without knowing the mass of the sledder. O 17.7 m/s O 12.5 m/s O 23.8 m/sCalculate the kinetic energy of a 300 g baseball thrown at a velocity of 44 m/s. NAS 440 J 290 J 580 J 510 J 13.2 J
- A 69 kg passenger in an airplane has a kinetic energy of 4.3x 10^6 j. What is the speed of the airplaneA 72 kg skiier goes down a 45 meter tall hill and reaches 26 m/s at the bottom of the hill. What is the percentage of the total energy that was lost to friction? A.17% B.23% C.52% D.46% E,31%? V m In the above image we see a 3.43 kg box that is moving to the right at 19.5 m/s. The box hits into a rough patch that applies a frictional force of 277 Newtons until the box comes to a stop. time K.E. E.P.E. Joules G.P.E. M.E Initial Joules Joules Joules Final Joules Joules Joules Joules How much work was done on the box by friction? Joules How far would the box travel before coming to a stop? meters
- A 1.0 kg cart is sliding to the right on a frictionless surface with speed 2 m/s. It collides head-on and sticks to a d.5 kg cart that is sliding to the left with speed 4 m/s. What is the kinetic energy of the combined carts after the collision? (Hint: Make a table!) A.O 2J B.O4J C. 0 J D.O6JA 7.00 kg bowling ball moves at 3.00 m/s. How fast must a 2.45 g table-tennis ball move in order to have the same kinetic energy as the bowling ball?A 0.500 kg bullet is fired from a gun at 25.0 m/s, how much kinetic energy does it have? 156.3 156.25 J 156 J 156.3 m
- Releasing some frustration at the end of the semester, you throw your physics book (mass of 4.3 kg) off of a 24 m tall building. You throw your book so that it has a speed of 3 m/s right after you let go. What is the kinetic energy of your book after you let go? (in J) 12.9 1.01×103 206 0 19.4 How how fast is your textbook moving right before it lands? For now, ignore friction. (in m/s) 21.9 17.5 24.7 21.5 If friction is NOT negligible, and 350 J of the textbook's energy is converted to thermal energy as it falls, how fast is it moving just before it lands? (in m/s) 17.8 17.5 12.8 25.3 25.0A 7.0 kg bowling ball moves at 2.45 m/s. How fast must a 2.60 g Ping-Pong ball move so that the two balls have the same kinetic energy?