Physics chapter 3 part 2

C) greater

Compared with hang time on Earth, hang time on the moon would be A) less B) the same C) greater

B) 10 m/s2

Neglecting air resistance, a bullet fired straight down from the top of a high cliff has an acceleration of A) less than 10 m/s2 B) 10 m/s2 C) more than 10 m/s2 D) depends on the height of the cliff

D) 30 m/s

Neglecting air resistance, how fast must you toss a ball straight up in order for it to take 6 seconds to return to its initial level A) 5 m/s B) 10 m/s C) 20m/s D) 30 m/s E) more than 30 m/s

B)the same

A ball is thrown upwards and returns to the same location. Compared with its initial speed its speed when it returns is about A) half as much B) the same C) twice as much D) four times as much

C) 10 km/h

A bird flying at 8 km/h in a 6 km/h crosswind has a resultant speed of A) 6 km/h B) 8 km/h C) 10 km/h D) 14 km/h

C)the same for each bullet

A bullet is dropped into a river from a very high bridge at the same time as another bullet is fired straight downward from a rifle. Neglecting air resistance the acceleration just before striking the water is A) greater for the dropped bullet B) greater for the fired bullet C)the same for each bullet D) none of the above

C) 5 km/h

A humming bird flying at 4 km/h that gets caught in a 3-km/h crosswind has a resultant speed of about A) 3 km/h B) 4 km/h C) 5 km/h D) more than 5 km/h

B) about 14 km/h

A seagull flying at 10 km/h in a 10-km/h crosswind has a resultant speed of A) 10 km/h B) about 14 km/h C) 20 km/h D) more than 20 km/h

C) 141 km/h

Am airplane that flies at 100 km/h in 100-km/h crosswind has a ground speed of A) 1 km/h B) 100 km/h C) 141 km/h D) 100 km/h

C) 100 km/h

An 80 km/h airplane caught in a 60 km/h crosswind has a resultant speed of A) 60 km/h B) 80 km/h C) 100 km/h D) 141 km/h

B) 70 km/h

An 80-km/h airplane flying against a 10-km/h head wind has a groundspeed of A) 10 km/h B) 70 km/h C) 80 km/h D) 90 km/h

D) 90 km/h

An 80-km/h airplane flying in the same direction as a 10-km/h tail wind has a groundspeed of A) 10 km/h B) 70 km/h C) 80 km/h D) 90 km/h

B) 20 m/s

An object at rest near the surface of a distant planet starts to fall freely. If the acceleration there is twice that of the Earth, its speed one second later would be A) 10 m/s B) 20 m/s C) 30 m/s D) 40 m/s

E) 100 m/s

An object falls freely from rest on a planet where the acceleration due to gravity in 20 m/s2. After 5 seconds the object will have a speed of A) 5 m/s B) 10 m/s C) 20 m/s D) 50 m/s E) 100 m/s

40 m/s

At one instant an heavy object in air is moving upward at 50 m/s. One second later its speed is approximately A) 40 m/s B) 50 m/s C) 55 m/s D)60 m/s

D) 60 m/s

At one instant an object in free fall is moving downward at 50 m/s. One second later its speed is A) 25 m/s B) 50 m/s C) 55 m/s D) 60 m/s E) 100 m/s

B) 20 m/s

If a freely falling object were equipped with a speedometer on a planet where the acceleration due to gravity is 20 m/s2, then its speed reading would increase each second by A) 10 m/c B) 20 m/s C) 30 m/s D) 40 m/s E) depends on its initial speed

C) greater than the second before

If an object falling freely were somewhere equipped with an odometer to measure the distance it travels, then the amount of distance it travels each succeeding second would be A) constant B) less and less each second C) greater than the second before D)doubled

B) 10 m/s2

If you throw a ball straight downward( in the absence of air resistance) after leaving your hand its acceleration is A)less than 10 m/s2 B) 10 m/s2 C) greater than 10 m/s2

B) 5 m/s

One half second after starting from rest, a freely falling object will have a speed of about A) 2 m/s B) 5 m/s C) 10 m/s D) 20 m/s E) none of the above

D) none of the above

The distance a freely falling object falls from rest in one-half second is A) 2 m B) 4 m C) 6 m D) none of the above

B) 2 s

The time it takes a projectile fired straight up at 10 m/s to reach the top of its path and return to its starting point is about A) 1 s B) 2 s C) 10 s D) 20 s

A) 1 s

The time it takes a projectile fired straight up at 10 m/s to reach the top of its path is about A) 1 s B) 2 s C) 10 s D) not enough information

B) speed

Which of the following is not a vector quantity A) velocity B) speed C) acceleration D) all are vector quantities E) none are vector quantities