A object of 100 kg tracing with the acceleration of 2.5 m/s 2. If the friction force between the floor and object is 50 N . Find the applied force on a object ?
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- A service elevator takes a load of garbage, mass 10.0 kg, from a floor of a skyscraper under construction, down to ground level, accelerating downward at a rate of 1.2m/s2 . Find the magnitude of the force the garbage exerts on the floor of the service elevator?A small diamond of mass 10.0 g drops from a swimmers earring and falls through the water, reaching a terminal velocity of 2.0 m/s. (a) Assuming the frictional force on the diamond obeys f=bv2 , what is b ? (b) How far does the diamond fall before it reaches 90 percent of its terminal speed?Three forces act on an object, considered to be a particle, which moves with constant velocity . Two of the forces are and . Find the third force.
- While sliding a couch across a floor, Andrea and Jennifer exert forces FA and FJ on the couch. Andrea’s force is due north with a magnitude of 130.0 N and Jennifer’s force is 32 east of north with a magnitude of 180.0 N. (a) Find the net force in component form. (b) Find the magnitude and direction of the net force. (c) If Andrea and Jennifer’s housemates, David and Stephanie, disagree with the move and want to prevent its relocation, with what combined forceFDS should they push so that the couch does not move?Suppose that the resistive force of the air on a skydiver can be approximated by f=bv2 . If the terminal velocity of a 50.0-kg skydiver is 60.0 m/s, what is the value of b?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?
- 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?(a) What is the weight of a 4.00 kg backpack? (b) What is the acceleration of the backpack if a net force of 10.0 N is applied? (a) w = (b) а %3D m/s?You want to push your 53.0 kg friend up the 33.0° ramp of a slide in a nearby park. You do so bypushing your friend with a 510.0 N horizontal force. The coefficient of kinetic friction betweenyour friend and the slide is 0.170. Find the acceleration of your friend up the slide. What is thenormal force from the ramp on your friend?
- A student pulls a box of books on a smooth horizontal floor with a force of100 N in a direction of 30.0◦above the horizontal. The mass of the box and the booksis 40.0 kg. Calculate the normal force acting on the box. Calculate the distance the box of books will travel if the student pullsfor 8.0 s.An object has a mass of 40 kg . It accelerate in a horizontal surface at the rate of 6m/s^2. The friction force on a object 20 N. Find the applied force on a object ?A horizontal force of 95.0 N is applied to a 60.0-kg crate on arough, level surface. If the crate accelerates at 1.20 m/s2, what isthe magnitude of the force of kinetic friction acting on the crate?