A tennis player hits a ball 2.0 m above the ground. The ball leaves his racquet with a speed of 25.0 m/s at an angle 4.6° above the horizontal, The Part A horizontal distance to the net is 7.0 m, and the net is 1.0 m high. Does the ball clear the net? O Yes O No Submit Previous Answers v Correct Part B By how much? Express your answer to two significant figures and include the appropriate units. HẢ ? h = 1.008 m

Frank “Cannonball” Richards was an American entertainer and vaudeville performer. He was famous for having incredibly strong abdominal muscles. In feats of strength, he would often let people punch him in the stomach, jump on him, and even hit him with sledgehammers. However, his greatest claim to fame was being shot in the stomach with a 47-kg (104 lb) cannonball (see the photoLinks to an external site.). While performing, Richards limited this demonstration to just twice a day, since it was quite painful. He would live a long life and pass away at age 81 in 1969. If the speed of the cannonball was 10.0 m/s right before it collided with Richards and the speed of the cannonball was 0.87 m/s right after the collision, what was Richards’s speed immediately after being struck by the cannonball? Assume Richards’s mass was 86 kg.

A 60 kg boy on roller skates moves with a speed of 4 m/s.  He runs into a 49 kg girl on skates. assuming they cling together after the collision, what is their speed?  Calculate answer to one decimal.

What is condition for conservation of momentum in a system? The total initial momentum must be zero The total final momentum must be zero Momentum is always conserved Momentum is never conserved None of these

To win a prize at the county fair, you're trying to knock down a heavy bowling pin by hitting it with a thrown object. Should you choose to throw a rubber ball or a beanbag of equal size and weight? Explain.

Enter the % kinetic energy remaining for Collision 1 Enter the % kinetic energy remaining for Collision 2.

Question 73 part a

Two identical cars, A and B, traveling at 55 mi/h collide head-on. A third identical car, C, crashes into a brick wall going 55 mi/h. Which car has the least damage: (a) car A, (b) car B, (c) car C, or (d) all the same?   Why is the answer C?

In the ammonia (NH3) molecule of the figure, three hydrogen (H) atoms form an equilateral triangle, with the center of the triangle at distance d = 9.40 × 10−11 m from each hydrogen atom. The nitrogen (N) atom is at the apex of a pyramid, with the three hydrogen atoms forming the base. The nitrogen-to-hydrogen atomic mass ratio is 13.9, and the nitrogen-to-hydrogen distance is L = 10.14 × 10-11 m. What are the (a) x and (b) y coordinates of the molecule's center of mass? (a) Number Units (b) Number N L HO H d H This answer has no units Units This answer has no units

Consider the diagram which shows a 2D collision between two balls of identical mass (the darker ball is initially at rest). What, if anything, is wrong with this collision? [select ALL of the correct statements from the list below] before 2.0 m/s after 1.89 m/s 0.85 m/s 25° 70⁰ The momentum is not conserved in the horizontal direction The kinetic energy decreases but it should not for this type of collision The momentum is not conserved in the vertical direction The kinetic energy is greater after the collision