7. A 225-kg crate is pushed horizontally with a force of 710 N. If the coefficient of friction is 0.20, calculate the acceleration of the crate.
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- A student is attempting to move a 30-kg mini-fridge into her dorm room. During a moment of Inattention, the mini-fridge slides down a 35 degree incline at constant speed when she applies a force of 25 N acting up and parallel to the Incline. What is the coefficient of kinetic friction between the fridge and the surface of the incline?Suppose the mass of a fully loaded module in which astronauts take off from the Moon is 1.00104kg . The thrust of its engines is 3.00104N . (a) Calculate the module’s magnitude of acceleration in a vertical takeoff from the Moon. (b) Could it lift off from Earth? If not, why not? If it could, calculate the magnitude of its acceleration.Check Your Understanding A block of mass 1.0 kg rests on a horizontal surface. The frictional coefficients for the block and surface are s=0.50and k=0.40 . (a) What is the minimum horizontal force required to move the block? (b) What is the block’s acceleration when this force is applied?
- Suppose you have a 120-kg wooden crate resting on a wood floor, with coefficient of static friction 0.500 between these wood surfaces. (a) What maximum force can you exert horizontally on the crate without moving it? (b) If you continue to exert this force once the crate starts to slip, what will its acceleration then be? The coefficient of sliding friction is known to be 0.300 for this situation.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.drawn An object upward 650N- Ihe Coefficient of friction between the object and the plane is. the angle of nclination 30 to Hhe horizontal of na ss 15 K9 1s inclined plane by a force ot an 0-40 and of the plane is t What is the acceleration of the object? b.1f at the top of the plane, Hhe object slide. down freely weight, with what acceleiation does it slide? on the plane under its Own c- What would be the acceleiation If the plane was frictionless?
- A 250.0 N box is placed on a horizontal surface and a force of 150 N is applied at anangle of 30.0o from the horizontal. As a result, the box slides along the surface with anacceleration of 05.00 m/s2What is the coefficient of friction between the box and the surface?A man pulls a 50kg box horizontally from rest while exerting a constant horizontal force, displacing the box 3m in 2s. Find the force the man exerts on the box. (Ignore friction) ANS. 75NYou are climbing on a hill that is inclined at 15degrees with the horizontal and you wish tobuild a rope tow to pull yourself up. Ignoring friction, calculate the tension you needed on therope to give your body that has a mass of 45kg a 1.5 m/s^2 acceleration. What if you are toconsider the friction of 100N, what is the value of the tension and coefficient of friction?
- Batman is driving his 1900 kg Batmobile down the hill from the Bat Cave. The hill is inclined at anangle of 20.o to the horizontal and has a coefficient of kinetic friction of 0.48. What force must theBatmobile’s engine apply to cause the Batmobile to achieve a net acceleration of 5.0 m/s2? Include aforce diagram.A car can decelerate at -3.80 m/s2 without skidding when coming to rest on a level road. What would its deceleration be if the road is inclined 9.3o and the car moves uphill? Assume the same static friction coefficient.A 15.0 kg box is being pulled along level ground by a 75.0 N force that is directed at an angle of 20o above the horizontal. The coefficient of kinetic friction is 0.330. What is the acceleration of the box?