3. Glider A, of mass m, moves to the right with constant speed v, on a frictionless track toward glider B. Glider B has mass 2m and is initially at rest.
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- A woman of mass m = 41 kg travels at a velocity vi = 1.5 m/s before leaping on a skateboard that is initially at rest. After leaping on the board the woman has a velocity vf = 1.41 m/s. 1) Write an expression for the weight of the skateboard W in terms of the mass of the woman m, the woman's initial velocity vi, the final velocity of the woman and board vf, and the acceleration due to gravity g and find the mass of the skateboard in kg.A bartender slides a mug of beer with mass 0.2 ?? down a smooth, level bar. The mug leaves the bartender’s hand at an initial velocity of 2.8 ?⁄? . As the mug slides, it slows down due to the effect of friction between the mug and bar. The mug just comes to rest in the customer’s hand 1.0 ? away from the bartender. Calculate the magnitude and direction of the frictional force acting on the mug4. A 10.0 kg puppy running at 3.00 m/s jumps onto a motionless 4.00 kg surfboard. The coefficient of kinetic friction between the puppy and the surfboard is 0.400. The surfboard skims without friction across the water. (a) How fast will the puppy skim across the water after jumping on the surfboard? (b) How much time will it take for the puppy to stop sliding on top of the surfboard after jumping onto the surfboard? (c) How far will the puppy slide on top of the surfboard?
- The upper mass is moving to the right with an initial velocity of 3 m/s. How far will mass A move before the system comes to rest if the coefficient of kinetic friction is 0.5. Set g=10m/s2. mass A=10 kg, mass B=5 kg3 3 d d d ed ed ed ed (7%) Problem 8: A 4.75 105-kg rocket is accelerating straight up. Its engines produce 1.15 107 N of thrust, and air resistance is 4.4. 1061 Randomized Variables m=4.75.105-kg f=1.15 107 N fr=4.4.106 N. ▷ What is the rocket's acceleration, using a coordinate system where up is positive? a= 24.211 sin() cos() cotan() asin()) atan() acotan() cosh() tanh() O Degrees Submit tan() J ( acos() E sinh() cotanh() Radians Hint 7 4 * 1 Feedback 8 9 5 6 2 3 ^^^ 1 + 0 VO BACKSPACE DEL I give up! HOME END CLEARA 42-kg skater is standing still in front of a wall. By pushing against the wall she propels herself backward with a velocity of -2.8 cm/s. Her hands are in contact with the wall for 0.80 s. Ignore friction and wind resistance. Find the average force (in N) she exerts on the wall (which has the same magnitude, but opposite direction, as the force that the wall applies to her).
- A 48.42kg hunter ropes a 167.82 kg sleeping polar bear and pulls the bear towards him until they meet. Originally they are 211.22 m apart on frictionless ice. When the hunter pulls the polar bear to him the hunter will move... a. 52 b. 810 c. 67 d. 160A 5.8-kg toboggan is kicked on a frozen pond, such that it acquires a speed of 2.1 m/s to the right. The coefficient of friction between the pond and the toboggan is 0.18. Determine the distance that the toboggan slides before coming to rest. Answer: m (round to the nearest hundredth)An electron with a speed of 1.10 × 107 m/s moves horizontally into a region where a constant vertical force of 3.70 × 10-16 N acts on it. The mass of the electron is 9.11 × 10-31 kg. Determine the vertical distance the electron is deflected during the time it has moved 27.0 mm horizontally. Number i Units ◆
- 3. Two kids on a seesaw: Two kids, each of mass 40 kg, sit on a seesaw. The seesaw has a mass of 15 kg. One kid sits at the end, 1.5 meters from the center. The other one sits 1.0 meters from the center. What are the magnitudes of the initial accelerations of a) the kid closer to the center and b) the kid farther from the center? 옷 1.0m 1.5mJacob, a professional heavyweight boxer, delivers a forceful punch with his fist and arm, combining for an effective punching mass of 2.56 kg. His fist strikes a heavy bag at a velocity of 9.1 m/s and comes to a halt 10.9 ms after initial contact. Determine the magnitude of the average net force that Jacob exerts on the heavy bag. a. 2137 N b. 3569 N c. 5321 N d. 2757 Ne. 6112 NAlice has a mass of 62.0 kg and Bob has a mass of 84.0 kg and they are initially standing at rest with respect to one another on a frictionless surface. They push against each other such that Alice moves at 0.04 m/s relative to her starting point. With what speed does Bob move away from his initial position? a. 0.03 m/s b. 0.09 m/s c. 1.21 m/s d. 32.2 m/s e. 1.6 m/s