When a car crashes into a brick wall, what is a good estimate of the power of th

Question

When a car crashes into a brick wall, what is a good estimate of the power of the collision? The kinetic energy of the car The kinetic energy of the car divided by the amount of time for which the car had been driving The kinetic energy of the car divided by the mass of the car The kinetic energy of the car divided by the duration of the collision The initial momentum of the car When a car crashes into a brick wall, what is a good estimate of the force of the collision? The initial momentum of the car The initial momentum of the car divided by the amount of time for which the car had been driving The initial momentum of the car divided by the mass of the car The initial momentum of the car divided by the duration of the colisaon The kinetic energy of the car Which of the following sentences use the correct units (focus on the units and whether it's energy or power - none are wrong because of the actual number)? A glass of wine contains about too Watt-hours of chemical energy A hair dryer needs about 1 kW/s of power The energy needed to lift a bicycle to the roof of a car is about 0.1 horsepower In an hour of running on a treadmill, you use up about 100 W of food energy Cameron's body consists, roughly speaking, of 80 kg of water at human body temperature (40 C) Suppose Cameron is standing next to a bath containing 160 kg of water at room temperature (20 C). Which of the following are true? The total heat energy of Cameron's body is greater than the total heat energy of the water in the bath. The total heat energy of Cameron's body is the same as the total heat energy of the water in the bath. The total heat energy of Cameron's body is less than the total heat energy of the water in the bath Which of the following has the lowest orbit? weather satellite spy satellite GPS TV satellite

Explanation / Answer

2) Power is change in kinetic energy over the time elapsed

d is correct option

3) According to impluse momentum theorem, the change in momentum is equal to impluse ( force times collision time) so force is change in momentum over collision time

d is the correct option

4) Energy is expressed in joules, kilowatt hour. power is expressed in watts and horse power. Option b,c, d have wrong units.

a is the correct option

5) Specific heat is same and product of mass and temperature is also same so heat energy possessed by both is also same.

b is the correct option

6) Global position satellite which are close to the earth surface.

c is correct option

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