Homework Answers
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A 2500 kg car is traveling 25 m/s and brakes to a stop. This causes the...
A 2500 kg car is traveling 25 m/s and brakes to a stop. This causes the brakes to heat up as the car’s kinetic energy is converted to thermal energy. If the heat in the brakes could be captured and applied to ice at 0 degrees Celsius, how much could it melt?
30 A 1300 kg car traveling at 36 mis slows to a stop in 12 s,...
30 A 1300 kg car traveling at 36 mis slows to a stop in 12 s, What is the magnitude of the net force on the car? a 3900 N с 100 N e There is not enough information given in the problem b. 3.0N C. 4.7 x 104 N
A 750 kg car slows to a stop from traveling southbound at 30 m/s over a...
A 750 kg car slows to a stop from traveling southbound at 30 m/s over a distance of 500 m. What was the acceleration needed to stop the car? How large was the force required to stop the car? Two cables are being used to pull a 100 kg sled on a frictionless surface. The first cable has a tension of 500 N in a direction 15o south of east. The other cable has a tension of 800 N in...
As part of a safety investigation, two 1600 kg cars traveling at 17 m/s are crashed...
As part of a safety investigation, two 1600 kg cars traveling at 17 m/s are crashed into different barriers. Find the average force exerted on the car that hits a line of water barrels and takes 1.4 s to stop. Find the average force exerted on the car that hits a concrete barrier and takes 0.18 s to stop.
A car of mass 875 kg is traveling 30.0 m/s when the driver applies the brakes,...
A car of mass 875 kg is traveling 30.0 m/s when the driver applies the brakes, which lock the wheels. The car skids for 5.60 s in the positive -direction before coming to rest. (a) What is the car's acceleration? (b) What magnitude force acted on the car during this time? (c) How far did the car travel? [Ans: ()-536 m/s (b) 4690 N(c) 84,0 m]
9. A car moving initially with a speed of S m/s brakes to a stop in...
9. A car moving initially with a speed of S m/s brakes to a stop in 10 s. The average braking force is 700 N. Find mass of the car.
A car of mass 772 kg is traveling 24.4 m/s when the driver applies the brakes,...
A car of mass 772 kg is traveling 24.4 m/s when the driver applies the brakes, which lock the wheels. The car skids for 5.27 s in the positive x-direction before coming to rest. a). What is the car's acceleration (in m/s2)? (Indicate the direction with the sign of your answer.) b). What magnitude force (in N) acted on the car during this time? c). How far (in m) did the car travel?
A 1890 kg car traveling at 13.3 m/s collides with a 2970 kg car that is...
A 1890 kg car traveling at 13.3 m/s collides with a 2970 kg car
that is initally at rest at a stoplight. The cars stick together
and move 1.96 m before friction causes them to stop. Determine the
coefficient of kinetic friction between the cars and the road,
assuming that the negative acceleration is constant and all wheels
on both cars lock at the time of impact.
A 1890 kg car traveling at 13.3 m/s collides with a 2970 kg...
17) Determine the work, in J, required to stop a 1500-kg car traveling at 30 m/s....
17) Determine the work, in J, required to stop a 1500-kg car traveling at 30 m/s. (hint: use the work-energy theorem). a) 2.4 x 105 b) 8.2 x 105 c) 1.7 x 105 d) 6.8 x 105 Answer_______________ 18) 10 J of heat are removed from a gas sample while it is being compressed by a piston that does 30 J of work. Determine, in J, the change in thermal energy of the system. a) 4 b) 10 c) 20...
A 1300 kg car moving at 5.4 m/s is initially traveling north in the positive y...
A 1300 kg car moving at 5.4 m/s is initially traveling north in the positive y direction. After completing a 90° right-hand turn to the positive x direction in 4.1 s, the inattentive operator drives into a tree, which stops the car in 280 ms. What is the magnitude of the impulse on the car (a) due to the turn and (b) due to the collision? What is the magnitude of the average force that acts on the car (c)...
30 A 1300 kg car traveling at 36 mis slows to a stop in 12 s, What is the magnitude of the net force on the car? a 3900 N с 100 N e There is not enough information given in the problem b. 3.0N C. 4.7 x 104 N
A car of mass 875 kg is traveling 30.0 m/s when the driver applies the brakes, which lock the wheels. The car skids for 5.60 s in the positive -direction before coming to rest. (a) What is the car's acceleration? (b) What magnitude force acted on the car during this time? (c) How far did the car travel? [Ans: ()-536 m/s (b) 4690 N(c) 84,0 m]
9. A car moving initially with a speed of S m/s brakes to a stop in 10 s. The average braking force is 700 N. Find mass of the car.
A 1890 kg car traveling at 13.3 m/s collides with a 2970 kg car
that is initally at rest at a stoplight. The cars stick together
and move 1.96 m before friction causes them to stop. Determine the
coefficient of kinetic friction between the cars and the road,
assuming that the negative acceleration is constant and all wheels
on both cars lock at the time of impact.
A 1890 kg car traveling at 13.3 m/s collides with a 2970 kg...
A 1300 kg car moving at 5.4 m/s is initially traveling north in the positive y direction. After completing a 90° right-hand turn to the positive x direction in 4.1 s, the inattentive operator drives into a tree, which stops the car in 280 ms. What is the magnitude of the impulse on the car (a) due to the turn and (b) due to the collision? What is the magnitude of the average force that acts on the car (c)...
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