Question

An Olympic sprinter can go from a state of rest to 11 meters per second in 10 seconds. What is the average acceleration of the sprinter?
A. 0.9 m/s
B. 110 m/s²
C. 110 m/s
D. 1.1 m/s²

@Vonte12

Answer 1

@Vonte12 By the way your username sounds french! :) LOL.

Answer 2

@nincompoop @AccessDenied @ganeshie8

Answer 3

@ShadyyKatie @tHe_FiZiCx99 @theredhead1617 @WisdomDaughter

Answer 4

1.1 m/s²

Answer 5

Newton's Second Law of Motion is expressed as F = ma.
A lawn mower with constant mass is pushed over a length of grass. An attachment is added that doubles its mass.

How much force is now required to push the lawnmower at the same rate of acceleration?
A. The force required is four times the original.
B. The force required is half the original value.
C. The force required is double the original value.
D. The force required remains constant.

Answer 6

A is the correct answer. Mass and force are directly proportional, so if you double mass, you double force also.

Answer 7

@theredhead1617 Thanks! :)

How much force is needed to stop a 90-kg soccer player if he decelerates at 15 m/s²?
A. 6 N
B. 15 N
C. 135 N
D. 1350 N

Answer 8

Force = mass × acceleration

Soo can you tell me the answer? @CrazyCountryGirl

Answer 9

KK... IDK

Answer 10

135 N

Answer 11

@theredhead1617 Thanks! :)

A satellite maintains an orbit equidistant from the earth at all points along its orbital path. How is the satellite affected by the earth's gravity?

A. The earth's pull of gravity acting on the satellite increases over the path of its orbit.
B. The earth's pull of gravity acting on the comet will be reversed over the path of its orbit.
C. The earth's pull of gravity acting on the satellite remains constant over the path of its orbit.
D. The earth's pull of gravity acting on the satellite decreases over the path of its orbit.

Answer 12

@theredhead1617

Answer 13

The force due to gravity between 2 bodies is

F=GMmr2


Where G is universal gravitational CONSTANT
M is the mass of Earth (which doesn't change)
m is the invariant mass of the satellite
and r is the radius of the CIRCLE of orbit
sooooo B would be the answer

Answer 14

THANKS!!! :)

This graph shows the velocity of a runner moving along a straight path over time.
According to the graph, which answer describes the runner's motion?
A. The runner stopped moving.
B. The runner's velocity was constant.
C. The runner's velocity decreased over time.
D. The runner's velocity increased over time.

Answer 15

@theredhead1617

Answer 16

A, because you see how the line just stops? Means the runner stopped moving.

Answer 17

yeah. :) Thanks!

What information is needed to determine the average velocity of a marble?
A. the mass of the marble and the force it was rolled with
B. the distance per unit time
C. the mass of the marble and the amount of gravity acting on the marble
D. the displacement of the marble and the change in time over which the displacement occurred
@theredhead1617

Answer 18

@theredhead1617

Answer 19

the answer is D, why? because the average velocity is defined this way in the mathematical model of describing physical phenomena:
V(average)=Δx/Δt

in order to find the instant velocity of the object you should take derivative of the function which gives you the exact place of the object at specific time.

Answer 20

Imagine a new planet is discovered with two moons of equal mass: Moon A and Moon B.
The mass of the new planet is greater than the combined mass of its moons.
Moon A is farther away from the new planet than Moon B.
What is the planet's gravitational pull on Moon A compared to the planet's gravitational pull on Moon B?

A. The gravitational pull on Moon B is greater than on Moon A because Moon B is farther away from the new planet than Moon A.
B. The gravitational pull on Moon A is the same as the gravitational pull on Moon B because distance does not affect the planet's gravity.
C. The planet's gravity repels Moon A with a greater force than it repels Moon B, which is why Moon A is farther away.
D. The gravitational pull on Moon B is greater than on Moon A because Moon B is closer to the new planet than Moon A.

Answer 21

@theredhead1617

Imagine a new planet is discovered with two moons of equal mass: Moon A and Moon B.
The mass of the new planet is greater than the combined mass of its moons.
Moon A is farther away from the new planet than Moon B.
What is the planet's gravitational pull on Moon A compared to the planet's gravitational pull on Moon B?

A. The gravitational pull on Moon B is greater than on Moon A because Moon B is farther away from the new planet than Moon A.
B. The gravitational pull on Moon A is the same as the gravitational pull on Moon B because distance does not affect the planet's gravity.
C. The planet's gravity repels Moon A with a greater force than it repels Moon B, which is why Moon A is farther away.
D. The gravitational pull on Moon B is greater than on Moon A because Moon B is closer to the new planet than Moon A.

Answer 22

Well, thanks! I mean if you don't explain how will someone learn?

and..

gravitational force inversely proportional to square of distance between objects
pull is greater on nearer object
so option D is the correct answer