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At a given instant in time, a 1.9-kg rock is observed to be falling under an acceleration of 1.7m/s2 downward. What is the magnitude of the net force in Newtons acting on the rock at that moment? (Think about how accelerations and forces are related)
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- Consider the two situations shown in Figure 4.30, in which there is no acceleration. In both cases the men pull with a force of magnitude F. Is the reading on the scale in part (i) of the figure (a) greater than, (b) less than, or (c) equal to the reading in part (ii)?A block of mass m = 5.8 kg is pulled up a = 25 incline as in Figure P4.24 with a force of magnitude F = 32 N. (a) Find the acceleration of the bloc k if the incline is frictionless. (b) Find the acceleration of the block if the coefficient of kinetic friction between the block and incline is 0.10. Figure P4.24A 2230-kg airplane starts from rest and, with a constant acceleration of magnitude 5.60 m/s^2, reaches its takeoff speed in 9.40 s. What is the magnitude of the net force on the airplane during this time interval? What is its takeoff speed?
- A person with a mass of 72.kg sprints with an acceleration of 6.3 m/s^2. What is the magnitude of force?A 2400 kg truck is towing a 600 kg trailer. If they move with an acceleration of 10 m/s2, the magnitude of the force exerted by the trailer on the truck isA 100-kg man stands in an elevator that starts to move from the fifth floor towards the first floor. In the initial portion of the trip, the elevator has an acceleration of 1.5 m/s2 . What is the force exerted by the floor on the man?
- A person of mass m = 55 kg is in an elevator which is accelerating upward at acceleration a= 2.3 m/s. What is the apparent weight in Newtons, of the person in the elevator during this ride? (Hint: the apparent weight is same as the normal force experienced by the person)A falling ball of mass 0.5 kg experiences a downward force due to gravity of mg (where g = 9.8 m/s2) and an upward force of air resistance equal to 3.5 N. What is the ball’s acceleration in units of m/s2?A person pushes a 0.20 kg lunch tray across a table, and it slows down as it slides because of friction. The coefficients of friction between the tray and the table are µs = 0.15 and µk = 0.11. What would the acceleration of the tray be?
- A car has a mass of 1.30 × 103 kg. If the force acting on the car is 6.49 × 103 N to the east, what is the car’s acceleration? Answer in units of m/s 2 .A constant force applied to A causes A to accelerate at 7 m/s^2. The same force applied to B causes an acceleration of 2 m/s^2. Applied to C, it causes an acceleration of 8 m/s^2. Which object has the largest mass? Which object has the smallest mass? What is the ratio mA/mB of the mass of A to the mass of B?On the moon, the acceleration due to gravity is equal to 1.67 m/s^2. How much does an astronaut weigh there, whose mass combined with his spacesuit is 171 kilograms.? Express your answer in units of Newtons.
