An 80 kg person is parachuting and experiencing a downward acceleration of 2.5 m/s2. The mass of the parachute is 5.0 kg. (a) What is the upward force on the open parachute from the air? (b) What is the downward force on the parachute from the person?
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- A mass M=99.2 kg is suspended by a massless string from the ceiling of a van which is moving with constant acceleration a, as shown in the figure below. (a)If the string makes an angle 20.0 degrees with respect to the vertical, what is the acceleration a of the van in m/s2? (b) What is the tension in the string in newtons?A fisherman is fishing from a bridge and is using a "30.0-N test line." In other words, the line will sustain a maximum force of 30.0 N without breaking. What is the weight of the heaviest fish that can be pulled up vertically, when the line is reeled in (a) at constant speed and (b) with an acceleration whose magnitude is 2.16 m/s2?A 58 kg person is parachuting and experiencing a downward acceleration of 2.8 m/s2. The mass of the parachute is 3.1 kg. (a) What is the upward force on the open parachute from the air? (b) What is the magnitude of the downward force on the parachute from the person?
- A lamp hangs vertically from a cord in a descending elevator that decelerates at 1.7 m/s2. (a) If the tension in the cord is 63 N, what is the lamp's mass? (b) What is the cord's tension when the elevator ascends with an upward acceleration of 1.7 m/s2?A 450 lb motorcycle accelerates from 0 to 55 mi/h in 6.0 s. (a) What is the magnitude of the motorcycle’s constant acceleration? (b) What is the magnitude of the net force causing the acceleration?Consider a person standing on a scale in an elevator. If the elevator accelerates upwards with an acceleration of 1.27 m/s2 and the person has a mass of 79.2 kg, what would the scale read? HINT: you need to take into account the acceleration due to gravity, as well as that of the elevator.
- At the end of a roller coaster ride, the cars must slow to a stop, but the magnitude of the acceleration cannot exceed 1.3 g's. Given a car with a mass of 1,700 kg (including the passengers), what is the magnitude of the maximum allowable force (in N)?A 9.0 kg object experiences an acceleration of 3.4 m/s2. (a)What is the magnitude of the resultant force acting on it (in N)? (b)If this same force is applied to a 5.4 kg object, what is the magnitude of the acceleration (in m/s2)?Two blocks A and B with mA = 0.9 kg and mB = 0.80 kg are connected by a string of negligible mass. They rest on a frictionless horizontal surface. You pull on block A with a horizontal force of 7.8 N. (A) Find the magnitude of the acceleration (in m/s2) of the blocks. (B) Determine the tension (in N) in the string connecting the two blocks.