Dynamics

Force a man must exert to pull a sled (8334)
23 de octubre de 2024, por F_y_Q

A man pulls a sled up a ramp using a rope attached to the front, as illustrated in the figure.
The sled has a mass of 80 kg. The kinetic friction coefficient between the sled and the ramp is (), the angle between the ramp and the horizontal is , and the angle between the rope and the ramp is . What force must the man exert to keep the sled moving at a constant speed?
Acceleration of an elevator with different readings on the weighing scale (7068)
12 de marzo de 2021, por F_y_Q

A person with a mass of 70 kg stands on a weighing scale in a moving elevator and observes different readings. Determine the acceleration of the elevator and wether it is moving up, down, accelereting, decelerating or stationary if the scale readings are: a) 66 kg, b) 74 kg and c) 70 kg.
Lengthening of a spring when a force is applied (4843)
11 de noviembre de 2019, por F_y_Q

A spring has an elastic constant of 120 N/m. Calculate how much it will lengthen if a force of 35 N is applied.