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- You want the final speed at the bottom of your roller coaster hill to be 25 m/s. What is the height (h) of the hill to achieve this? Use g = 9.8 m/s2In the potential energy experiment. If the kinetic energy of the system composed of masses m, and m2 is 0.648 J. Given that the masses are moving at a speed of 1.23 m/s find the mass of the cart m, ( in units of kg) when m2= 110 g. т, m2 Select one: O A. 1.054 O B. 1.071 O C. 0.747 O D. 0.857 O E. 0.3181. Sam, whose mass is 75 kg, takes off across level snow on his jet-powered skis. The skis have a thrust of 200 N and a coefficient of kinetic friction on snow of 0.10. Unfortunately, the skis run out of fuel after only 10 s. A. What is Sam’s top speed? B. How far has Sam traveled when he finally coasts to a stop?
- 6. Two packages that start sliding down a 20° ramp from rest a distance d = 4.30 m. For package A: Ma = 5.00 kg and ukA = 0.30. %3D For package B: mB = 7.00 kg and ukB = 0.20. Find the speed of both packages when they reach the bottom. 20°A particle of mass 1.5kg moves according to the equation x(t)=10t2, where x is in meters andtis in seconds. The force (in N) acts on the particle is Select one: a. 40 b. 35 с. 25 d. 30A parachutist is falling with speed of 55 m/s when his parachute opens. If the air resistance O a. 25 m/s O b. 50 m/s O c. 40 m/s O d. 30 m/s O e. None wy2 -N, where w is the total weight of the man and parachute, find his speed if t = 10sec. Note:Net force on system = weight of system - air resistance. 25
- ITUATION: The 5kg block passes over B at a velocity of 4.20 m/s. B 40° R=2.8m Calculate the normal force at B, Newtons. а. 17.55 C. 76.34 b. 27.30 d. 80.55 Determine the speed at A without losing contact with the path (Normal force = 0), meters per seconds. а. 4.59 C. 3.42 b. 6.30 d. 7.25A student wants to angle a ramp such that if she releases a 2.8kg cart at the top of a ramp, the cart will travel 210cm and hit the end of the ramp in 1.6s. Neglect backwards friction and drag. What does the magnitude of the net force on the cart need to be? What does the magnitude of the cart's acceleration need to be? At what incline angle (0) does the ramp need to be slanted? m/s2 What will be the maximum speed of the cart? m/s cannot be detem check answers44. A 15 kg child slides, from rest, down a play- ground slide that is 4.0 m long, as shown in the figure. The slide makes a 40° angle with the horizontal. The child's speed at the bot- tom is 3.2 m/s. What was the force of friction that the slide was exerting on the child? 傳 4.0 m 40°
- 7If the 80kg cabinet is allowed to roll down the inclined plane, determine the acceleration of the cabinet and the normal reactions on the pair of rollers at A and B that have negligible mass. 1.5 m B 0.5 m 0.5 mIl a 45 kg skater is moving at 17.1 m/s when he starts up a hill, how high will he go before he stops?