Question 1 of 20 - 15 View Policies Current Attempt in Progress The force component acting on an object along the displacement varies with the displacement s as shown in the graph. Determine the work done on the object as it travels from s= 0.0 to 12 m. F cos e (N) 0 3 6 9 12 s (m) O 72 J O 48 J O 81 J O 57 J O 66 JQuestion 2 of 20 > - 15 IE ... View Policies Current Attempt in Progress Larry's gravitational potential energy is 1870 J as he sits 2.20 m above the ground in a sky diving airplane before it takes off. What is Larry's gravitational potential energy when he begins to jump from the airplane at an altitude of 923 m? O 4.22 x 106 J O 1.87 x 103 J O 9.36 x 102 J O 3.29 x 104 J O 7.85 x 105 JQuestion 3 of 20 - 15 IE View Policies Current Attempt in Progress Starting from rest at the top, a child slides down the water slide at a swimming pool and enters the water at a final speed of 4.32 m/s. At what final speed would the child enter the water if the water slide were twice as high? Ignore friction and resistance from the air and the water lubricating the slide. Vf = Number UnitsQuestion 4 of 20 f 5 E View Policies Current Attempt in Progress A ball is fixed to the end of a string,which is attached to the ceiling at point P. As the drawing shows, the ball is projected downward at A with the launch speed v0. Traveling on a circular pathr the ball comes to a halt at point B. What enables the hall to reach point B, which is above pointA? Ignore friction and air resistance. O The ball's initial gravitational potential energy. 0 The work done by the gravitational force. 0 The ball's initial kinetic energy. 0 Thework done by the tension in the string. Question 5 of 20 > - 15 View Policies Current Attempt in Progress A block of mass m is released from rest at a height R above a horizontal surface. The acceleration due to gravity is g. The block slides along the inside of a frictionless circular hoop of radius R. R Which one of the following expressions gives the speed of the mass at the bottom of the hoop? OU= mg 2R O v2 = 2gR 0 12 = R O v= mgR O zero m/s2Question 6 of 20 _ g 5 ;: : View Policies Current Attempt in Progress A 1330-kg car starts from rest at the bottom of a driveway and has a speed of 3.00 mfs at a point where the driveway has risen a vertical height of 0.600 m. Friction and the drive force produced by the engine are the only two non-conservative forces present. Friction does 28?0J of work. How much work does the engine do? irlflgngim3 = Number n Units. v Question 7 of 20 - 15 View Policies Current Attempt in Progress A basketball player makes a jump shot. The 0.600-kg ball is released at a height of 2.05 m above the floor with a speed of 7.53 m/s. The ball goes through the net 3.10 m above the floor at a speed of 3.91 m/s. What is the work done on the ball by air resistance, a nonconservative force? Number i UnitsQuestion 8 of 20 I 5 E View Policies Current Attempt in Progress A 66.0kg personjumps from rest off a 3.60mhigh tower straight down into the water. Neglect air resistance during the descent. She comes to rest 1.30 m under the surface ofthe water. Determine the magnitude ofthe average force that the water exerts an the diver. This force is nonconservative. Number I Units V Question 9 of 20 - 15 ".. View Policies Current Attempt in Progress A 65.0-kg mountain climber just ate a Johnny Rocket's bacon-cheddar-double-burger meal along with two peanut butter milkshakes, which have 5810 Calories (5810 kilocalories). Assume she can convert these calories into energy with 100% efficiency and use the fact that 1 kcal = 4186 J. Calculate how many times she could climb up Mt. Everest - the world's tallest mountain. The height of Mt. Everest is 8840 m. Number i UnitsQuestion 15 of 20 - I 5 E View Policies Current Attempt in Progress _} The skateboarder in the gure is coasting down a ramp, and there are three forces acting on her: her weight W {magnitude = 690 N}, a } b frictional force f {magnitude = 214M} that opposes her motion, and a normal force F N {magnitude = 609 N}. Determine the net work > > done {a} by the weight W. {b} by the frictional force f , and [c] by the normal force F N when she coasts for a distance of 9.80 ml 1'" lu'lleight component (b) [a] Number Units V Question 17 of 20 f 5 E 01-. View Policies Current Attempt in Progress Force F1 acts on a particle and does work W1. Force F2 acts simultaneously on the particle and does work W2. The speed ofthe particle does not change. Which one of the following must be true? 0 W1 = W; 0 W1 is positive, and W2 is zero 0 W1 is positive, and W2 is positive 0 W1 is zero, and W2 is positive Question 18 of 20 - 15 ... View Policies Current Attempt in Progress The kinetic energy of a car is 8 x 10 J as it travels along a horizontal road. How much work is required to stop the car in 10s? O 8 x 106 J O zero joules O 8 x 105 J O 8 x 104 J O 8 x 10' JQuestion 19 of 20 > - 15 E . .. View Policies Current Attempt in Progress A 12.5-kg crate slides along a horizontal frictionless surface at a constant speed of 4.0 m/s. The crate then slides down a frictionless incline and across a second horizontal surface as shown in the figure. 4.0 m/s 3.0 m 4.0 m What is the kinetic energy of the crate as it slides on the upper surface? O 30 J O 200 J O 80 J O 490 J O 100 JQuestion 20 of 20 Previous question - 15 UN - View Policies Current Attempt in Progress You are moving into an apartment and take the elevator to the oth floor. Suppose your weight is 800 N and that of your belongings is 1000 N. (a) Determine the work done by the elevator in lifting you and your belongings up to the 6th floor (15.2 m) at a constant velocity. (b) How much work does the elevator do on you alone (without belongings) on the downward trip, which is also made at a constant velocity? (a) Work = (b) Work = V v