1250-mt1-practice.pdf

T h o f e o m id top e sam the e e thi ne ter...

T h o f e o m id top e sam the e e thi ne ter th t o n qu s p s y m ge ati ag ou on e a ’ll s a re tt he 1) A tennis ball is dropped onto the floor and bounces. During the time that the tennis ball is in contact with the floor, the magnitude of the average normal force that the floor exerts on the tennis ball is… (a) zero (b) less than the weight of the tennis ball, but not zero (c) equal to the weight of the tennis ball (d) greater than the weight of the tennis ball (e) cannot be determined from the information provided 2) A small tugboat of mass m pushes on a large cruise ship of mass M, with M significantly larger than m. What is the ratio of [the force that the cruise ship applies to the tugboat]/[the force that the tugboat applies to the cruise ship]? (a) ∞ (the tugboat doesn’t apply a force to the cruise ship) (b) less than ∞ but greater than M/m (c) M/m (d) less than M/m but greater than 1 (e) 1 (f) less than 1 but greater than m/M (g) m/M (h) less than m/M but greater than 0 (i) 0 (the cruise ship doesn’t apply a force to the tugboat) 3) An applied force F!" pushes block A such that both blocks accelerate at a = 1.0 m/s2 to the right. Block A has a mass mA = 3.0 kg and block B has a mass mB = 7.0 kg. Assuming there is no friction, what is the magnitude of the force applied by B on A? (a) 3.0 N (b) 5.0 N 𝐹!" (c) 7.0 N B A (d) 10.0 N (e) 14.0 N (f) 20.0 N (g) 28.0 N 4) A soccer player kicks a ball as it sits on the ground. The ball’s initial velocity after the kick is 26 m/s at an angle of 38° above horizontal. What is the maximum height of the ball above the ground? (a) 0 (e) 21 m (b) 9.8 m (f) 26 m (c) 13 m (g) 34 m (d) 16 m (h) 79 m 5) A refrigerator with a weight of 500 N sits on a floor. The coefficient of kinetic friction is 0.30 and the coefficient of static friction is 0.40. A force of 100 N is applied horizontally to the refrigerator. What is the magnitude of the friction force on the refrigerator (a) 0 N (d) 200 N (b) 100 N (e) 500 N (c) 150 N (f) 980 N 6) An engineering student takes his rocket to the top of Lincoln Tower, which is 79 m high. He aims it straight down and ignites the rocket engine. The thrust of the rocket, along with gravity, gives the rocket a downward acceleration of 16 m/s2. What is the speed of the rocket as it hits the ground? (a) 5 m/s (d) 50 m/s (b) 9.8 m/s (e) 79 m/s (c) 40 m/s (f) 343 m/s 7) A truck drives over a curved hill. What is the minimum coefficient of friction between the truck tires and the road so that, at the point shown in the figure, the truck can maintain a constant speed of 14 m/s? You may treat the truck as if it were a point particle. R=60 m 27° 8) An object of mass m1 = 3 kg placed on a horizontal surface with a kinetic coefficient of friction equal to 0.1 is connected to a string that passes over a pulley and then is fastened to an object of mass m2 = 3 kg on a frictionless incline plane. Consider the string and pulley to be massless and frictionless. Find the acceleration of the boxes.