PHY 121 Exams 1-4 questions and
answers rated A+ passed
Up - correct answer ✔✔ 2.1 When you sit on a chair, the resultant force on you is
down
up
zero
depending on your weight
move with constant speed. - correct answer ✔✔ 2.2 When the rocket engines on the starship
NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty space, the starship will
stop immediately
go faster and faster.
slowly slow down, and then stop.
move with constant speed.
,500mi - correct answer ✔✔ 1.1 Starting from city A, a car drives 250 miles east to city B, then
300 miles north to city C, and finally 700 miles west to city D. What is the distance between city
A and city D?
Question options:
600 mi
400 mi
500 mi
300 mi
The force on the truck is equal to the force on the car - correct answer ✔✔ 2.3 A 15-ton truck
collides with a 1500-lb car and causes a lot of damage to the car. Since a lot of damage is done
on the car
Question options:
the truck did not slow down during the collision.
,the force on the truck is greater than the force on the car.
the force on the truck is equal to the force on the car.
the force on the truck is smaller tan the force on the car.
2.7x10^4 - correct answer ✔✔ 2.4 A sports car of mass 1000 kg can accelerate from rest to 35
m/s in 1.3 s. What is the average forward force on the car?
Question options:
1.9 × 10^5 N
2.6 × 10^2 N
2.7 × 10^4 N
3.9 × 10^3 N
Average Acceleration - correct answer ✔✔ 1.2 A new car manufacturer advertises that their car
can go "from zero to sixty in 8 s". This is a description of
, Question options:
average acceleration
average speed
instantaneous acceleration
instantaneous speed
Yes, although the speed is constant, the direction of the velocity can be changing - correct
answer ✔✔ 2.5 Is it possible for an object moving with a constant speed to accelerate? Explain.
Question options:
Yes, if an object is moving it can experience acceleration
Yes, although the speed is constant, the direction of the velocity can be changing.
No, if the speed is constant then the acceleration is equal to zero.
No, an object can accelerate only if there is a net force acting on it
answers rated A+ passed
Up - correct answer ✔✔ 2.1 When you sit on a chair, the resultant force on you is
down
up
zero
depending on your weight
move with constant speed. - correct answer ✔✔ 2.2 When the rocket engines on the starship
NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty space, the starship will
stop immediately
go faster and faster.
slowly slow down, and then stop.
move with constant speed.
,500mi - correct answer ✔✔ 1.1 Starting from city A, a car drives 250 miles east to city B, then
300 miles north to city C, and finally 700 miles west to city D. What is the distance between city
A and city D?
Question options:
600 mi
400 mi
500 mi
300 mi
The force on the truck is equal to the force on the car - correct answer ✔✔ 2.3 A 15-ton truck
collides with a 1500-lb car and causes a lot of damage to the car. Since a lot of damage is done
on the car
Question options:
the truck did not slow down during the collision.
,the force on the truck is greater than the force on the car.
the force on the truck is equal to the force on the car.
the force on the truck is smaller tan the force on the car.
2.7x10^4 - correct answer ✔✔ 2.4 A sports car of mass 1000 kg can accelerate from rest to 35
m/s in 1.3 s. What is the average forward force on the car?
Question options:
1.9 × 10^5 N
2.6 × 10^2 N
2.7 × 10^4 N
3.9 × 10^3 N
Average Acceleration - correct answer ✔✔ 1.2 A new car manufacturer advertises that their car
can go "from zero to sixty in 8 s". This is a description of
, Question options:
average acceleration
average speed
instantaneous acceleration
instantaneous speed
Yes, although the speed is constant, the direction of the velocity can be changing - correct
answer ✔✔ 2.5 Is it possible for an object moving with a constant speed to accelerate? Explain.
Question options:
Yes, if an object is moving it can experience acceleration
Yes, although the speed is constant, the direction of the velocity can be changing.
No, if the speed is constant then the acceleration is equal to zero.
No, an object can accelerate only if there is a net force acting on it
