at each of the three locations. 6. A freight train has a mass of 1.5 X 107 kg. If the locomotive can exert a constant pull of 7.5 X 105 N, how long does it take to increase the speed of the train from rest to 80 km/h? 500
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- 6:50 PM Wed Apr 5 < = ☹ AA UI 3. A rocket has a mass of 1.00 x 105 kg. Its engines develop a thrust of 2.50 x 106 N, what is the acceleration of the rocket? 4. A car is travelling on a level highway at a speed of 15 m/s. A breaking force of 3,000 N brings the car to a stop in 10 s. What is the mass of the car? G 5. Find the force needed to accelerate a 50 kg crate up a 30.0° incline at a rate of 1.2 m/s². 6. A 1200 kg elevator is lowered at a constant velocity. Find the tension in the cable. 7. Two 4.0 kg masses are pulled by 2.5 kg mass on a horizontal air track. What is the acceleration of the system? Find the tension between the two 4.0 kg masses. 8. Two forces pull a 7.00 kg object: 20.5 N East and 32.0 N 67.5° South of East. Find the force needed to keep the object stationary. 1.2m /12 Fnet =ma_boN Fapp aut kg P20 Unit B Review √30° F₁₂=m-a=√ 37% a n 1 of 313. A woman pulls a sled with her son (total mass of 8o kg) with a force of 180 N angled at 20° from the horizontal. The woman is able to move the sled 5 m along the horizontal. What is the sled's velocity after it has moved 5 m, assuming that it started from rest and there is no friction?6. An elevator cab is pulled upward by a cable. The cab and its single occupant have a combined mass of 2000 kg.When that occupant drops a coin, its acceleration relative to the cab is &8.00 m/s2 downward. What is the tension in the cable? onto a
- 2. A 50.0 object is moving at a velocity of 30.0 m/s must come to a stop in 2.00m. How much force is required to bring it to a stop?moodle.nct.eduom/mod/qi -Learning Portal Courses - Reports - e-Services- Academic Departments - ETC - CIMS - A 17kg crate resting on a horizontal surface is pushed as shown. If the coefficient of static friction u, between the surfaces is 0.24, what is the minimum force (F) required to start the motion? O a 4.08N O b. 70.83N Oc 39.98N Od. 694.17N Windows buut An object of mass Skg is sliding with a constant velocity of 10m/s on a frcitionless horizontal table. The force needed to keep the object moving with the same velocity is. 144 4- # 4. 6. V.6. A 60 kg man jumps 1.00 m down onto a concrete walkway. His downward motion stops in 0.0200 seconds. If he forgets to bend his knees, what force is transmitted to his leg bones? [Hint: Solve for the velocity of the man at instant his feet strike the ground using free-fall formulas. Solve for acceleration as he brought into rest. Then apply newton's second law.]
- What force necessary to accelerate a 3000 Ibs railway electric car at the rate of 1.25 ft/sec2, if the force required to overcome the frictional resistance is 400 Ibs. W = 3000 Ibs a P F 400 Ibs O 1564.596 Ibs O 1267.382 Ibs O 1653.397 Ibs O 1427.937 IbsDave with a mass of 60 kg goes tubing down a 20 m long hill that has an angle off the horizon of 25º. (Gravity applies) a. He gets a push from the bottom of the hill, so his initial velocity is 2 m/s. How far up the hill will he go before stopping? (there’s no friction) b. He goes back down the hill and then his friend Jill tries to pull him on the tube across a small patch of grass (μk=0.30). If she is pulling parallel to the ground at constant 5 m/s for 5 sec how much power does she expend? c. After climbing back uphill, Dave decided to roll down the hill instead. If he were to be a long cylinder with a radius of 0.1 m, what is his moment of inertia? d. After rolling without slipping down the hill, what is Dave’s final velocity at the bottom of the hill? What is his angular velocity at the bottom of the hill? Dave with a mass of 60 kg goes tubing down a 20 m long hill that has an angle off the horizon of 25º. (Gravity applies) He gets a push from the bottom of the hill, so his…In the figure, the block of mass 2.00 kg accelerates down the inclined plane. The coefficient of kinetic friction is 0.200 and angle of the inclined plane is 30.0°. What is the acceleration of the block? normal force N friction force f mg sine mg cose mg O 3.05 mis? O 5.05 m/s? O 2.05 m/s? O 4.05 m/s?
- A b o d y o f m a s s 50 g i s a t r e s t o n a h o r i z o n t a l s u r f a c e . A constant horizontal force is applied for 10s. Find the force if the final velocity acquired its 36 m/s (neglect friction).A 20.0kg toboggan is pulled out of deep snow by 2 people. The first person pulls 20.0N [E 30.0 N], the second pulls 15.0 N [E 20.0 S] and the snow bank pulls 8.00 N [W]. What's the acceleration?A parachutist relies on air resistance to decrease her downward velocity. She and her parachute have a mass of 55kg, air resistance exerts a total upward force of 600N on her and her parachute. What is the acceleration of the parachutist.