A ski jumper starts from rest 47.5 m above the ground on a frictionless track and flies off the track at an angle of 45.0° above the horizontal and at a height of 18.0 m above the ground. Neglect air resistance.
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A ski jumper starts from rest 47.5 m above the ground on a frictionless track and flies off the track at an angle of 45.0° above the horizontal and at a height of 18.0 m above the ground. Neglect air resistance.
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- A 537-kg trailer is hitched to a truck. Find the work done by the truck on the trailer in each of the following cases. Assume rolling friction is negligible. a. The trailer is pulled at constant speed along a level road for 2.30 km. b. The trailer is accelerated from rest to a speed of 88.8 km/h. c. The trailer is pulled at constant speed along a road inclined at 12.5 for 2.30 km.A ski jumper starts from rest 47.5 m above the ground on a frictionless track and flies off the track at an angle of 45.0° above the horizontal and at a height of 11.0 m above the ground. Neglect air resistance. (a) What is her speed when she leaves the track? (b) What is the maximum altitude she attains after leaving the track? (c) Where does she land relative to the end of the track?79. ssm A student is skateboarding down a ramp that is 6.0 m long and inclined at 18° with respect to the horizontal. The initial speed of the skateboarder at the top of the ramp is 2.6 m/s. Neglect friction and find the speed at the bottom of the ramp.
- A 52 kg skier starts from rest at height H = 17 m above the end of a ski-jump ramp (see the figure). As the skier leaves the ramp, his velocity makes an angle of 0 = 25° with the horizontal. Neglect the effects of air resistance and assume the ramp is frictionless. (a) What is the maximum height h of his jump above the end of the ramp? (b) If he increased his weight by putting on a 10 kg backpack, what would h be? End of H ramp (a) Number i Units (b) Number i Units >Help me pleaseA catapult launches a large stone at a speed of 45.0 m/s at an angle of 55.0° with the horizontal. What maximum height does the stone reach? (Neglect air friction.)
- A 64 kg skier starts from rest at height H = 27 m above the end of a ski-jump ramp (see the figure). As the skier leaves the ramp, his velocity makes an angle of θ = 23° with the horizontal. Neglect the effects of air resistance and assume the ramp is frictionless. (a) What is the maximum height h of his jump above the end of the ramp? (b) If he increased his weight by putting on a 10 kg backpack, what would h be?A child starts from rest and slides without friction from a height of h = 7.4 m along a slide next to a pool (see figure). She is launched from a height of 1.6 m (ignore the h/5 in the figure) at an angle of 28° into the air over the pool. Use g=9.8 m/s?. h Утах th/5 What is her maximum height above the water after leaving the slide? Hint: it is possible to do this without doing projectile motion, even desirable as we are trying to learn conservation of energy; this problem does require you to use conservation of energy more than once.A space vehicle is launched vertically upward from the Earth's surface with an initial speed of 7.35 km/s, which is less than the escape speed of 11.2 km/s. What maximum height does it attain?
- The drawing shows a skateboarder moving at 6.90 m/s along a horizontal section of a track that is slanted upward by 0 = 46.0° above the horizontal at its end, which is 0.510 m above the ground. When she leaves the track, she follows the characteristic path of projectile motion. Ignoring friction and air resistance, find the maximum height H to which she rises above the end of the track. Number 6.90m/s i H 0.510m UnitsTarzan, in one tree, sights Jane in another tree. He grabs the end of a vine with length 20 m that makes an angle of 45° with the vertical, steps off his tree limb, and swings down and then up to Jane’s open arms. When he arrives, his vine makes an angle of 30° with the vertical. Determine whether he gives her a tender embrace or knocks her off her limb by calculating Tarzan’s speed just before he reaches Jane. Ignore air resistance and the mass of the vine.You wish to make a simple amusement park ride in which a steel-wheeled roller-coaster car travels down one long slope, where rolling friction is negligible, and later slows to a stop through kinetic friction between the roller coaster's locked wheels sliding along a horizontal plastic (polystyrene) track. Assume the roller coaster car (filled with passengers) has a mass of 750.5 kg and starts 83.4 m above the ground. (a) Calculate how fast the car is going when it reaches the bottom of the hill m/s (b) How much does the thermal energy of the system change during the stopping motion of the car? (C) If the car stops in 234.67 m, what is the coefficient of kinetic friction between the wheels and the plastic stopping track?
