A student graph the data obtained from Newton's second law as shown, what is the total mass of the system? where the gravitational constant g-9.8m/s 80 120 140 160 180 200 20 40 60 100 M-M, (GRAMS) O a. 310g O b. 200g O c.280g
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- 18. Auto companies frequently tests the safety of the automobiles by putting them through crash tests to observe the integrity of the passenger compartment. If a 1000 kg car is sent down a cement wall with a speed of 14 m/s and the impact brings it to a stop in 8.00 x 10^-2 s, with what average force is it brought to rest? *Use g=9.8 a. 145 000 N b. 212 000 N c. 315 000 N d. 175 000 N e. 423 000 N1Which of the following statements are impossible? Choose all that apply. a. The parked truck had 8770 J of KE. b. The scooter had 0 J of KE and 0 kg m/s of momentum. c. A ball moving in a circle had 0 N of net force acting on it. d. A box had an acceleration of 0 m/s2 while a net force of 311 N acted on it. e. Jack exerted 18 N of force due east on a cart. As a direct result, the cart exerted 18 N of force due west upon Jack. f. A toothpick exerts a smaller gravitational force upon the Moon than the Moon exerts upon it.
- G,h pleasec. None of the above O d. zero e. 26 CLEAR MY CHOICE An object witha mass of 0.5 Kg is thrown vertically upward with a speed of 15 m/s. What are its speed and direction tvwo seconds later? O a. 9.8 m/s downward O b. O m/s O c. 10.1m/s downward O d. 4.6 m/s downward e. 4.6 m/s upward NEXT PAVy mปs 3 m/s 1. An object of mass of 4.0 kg is initially moving with a velocity v, as shown. It then experiences a force that changes its velocity to v,, as shown. The object's change in momegtum has a magnitude of which of the following. B. 8.0 kg m/s A. 4.0 kg· m/s C. 12 kg m/s 2. What would be the change in kinetic energy of the object? D. 16 kg m/s A. 16 J B. 18 J. С. 32 J D. 64 J
- -? is 30. When two identical air pucks with repelling magnets are held together on an air table and then released, they end up moving in opposite directions at the same speed, v. Assume the mass of one of the pucks is doubled and the procedure is repeated. a. From Newton's third law, show that the final speed of the double-mass puck is half that of the single puck. b. Calculate the speed of the double-mass puck if the single puck moves away at 0.4 m/s.Curling is a sport played with 20 kg stones that slide across an ice surface. Suppose a curling stone sliding at 1 m/s strikes another, stationary stone and comes to rest in 2 ms. Approximately how much force is there on the stone during the impact?A. 200 N B. 1000 N C. 2000 N D. 10,000 N51. Challenge Problem Escape Velocity From physics, the equation for the free-flight trajectory of a satellite launched a distance ro from the center of the earth is given by the polar equation GM GM. cos e+ råvo ro rovo where M, is the mass of the earth, G is the gravitational constant, and vo is the initial velocity of the satellite. If the initial velocity is equal to the escape velocity (the velocity needed to overcome Earth's gravitational pull) then the resulting trajectory follows a parabolic path. What is the escape velocity?
- A 0.16 kg billiard ball was traveling at 3.7 m/s when it collided with another billiard ball of the same mass. The first billiard ball came to a stop as a result of the collision. What was the final velocity of the second ball? A. 0.0 m/s B. 0.59 m/s C. 3.7 m/s D. 1.1 m/s8. If we exert 1200N on an object to cause it to accelerate 0.55m/s2, what is the mass of the object?60 Look at the diagram. a i Calculate the minimum speed v the ball must have in order to make it to position B. ii What speed will the mass have at B? b Given that v= 12.0 ms¹, calculate the speed at A and B. 4.0 m A 2.0 m B