Physical science exam 4
A car moves four times as fast as an identical car compared to the slow car the faster car has ____
16 times the KE
A 4 kg ball has a momentum of 12 KGM/S. What is the ball speed
3M/S
Which of the following has the largest momentum relative to earth.
A pick up truck speeding along the highway
Which requires more work at lifting of 50 kg sack vertically 2 meters? Or lifting a 25 kg sack vertically 4 m?
Both requires the same amount of work
A flower pot of mass M falls from the rest to the ground below a distance H. Which statement is correct
The KE of the pot when it hits the ground is proportional to H
Is it correct to say that impulse is equal to_____________
The change in momentum
Supposed gun were made of strong but very light material suppose also that the pellet is more massive than the gun itself for such a weapon_________
The target would be safer than the shooter
One object is lifted 10 m, against a certain amount of potential energy if the same object is lifted 20 m it's potential energy gain is
Twice as much
If you push an object twice as far while playing the same force you do
Twice as much work
And 1 kg chunk of party moving out one M/S strikes in sticks 205 kg bowling ball that is initially address. After the putty to the ball both move with a combined momentum
1/6 m/s
If you exert 100 J in 50 s, your power output is
2W
The average momentum of a 70 kg runner who covers 400 M in 50 S is
560 KGM/S
When a car is braked to stop, it's kinetic energy is transformed to
Heat
A moving object on which no forces are acting will continue to move with constant
Momentum
If the speed of a moving object doubles what else doubles
Momentum
A car traveling along the highway needs a certain amount of force exerted on it to stop. More stopping force may be required when the car has______
More mass, more momentum, less stopping distance
If you push for an hour against a stationary wall, you do no work
On the wall
A job is done slowly, and an identical job is done quickly. Both jobs require the same amount of work but different amounts of work, but diffrent amounts of _____
Power
A moving object has
momentum, energy, and speed
A 500 kg freight car runs into a 10,000 kg freight car at rest. The couple upon collision a move at the speed of 2 m/S. What was the initial speed of the 5000 kg car
6 m/s
A 2 kg mass is held 4 m above the ground, what is the approximate total potential energy of the mass with respect to the ground
80 J
In order to catch a ball and baseball player extends the head forward before impact with the ball and then let it ride back word in the direction of the balls in motion a call in back doing this reduces the force of impact on the players hand prinic because
Time of impact is increased
