Question

help with a few questions? i will fan and medal

Answer 1

@welshfella @mathmale @mathmate @pooja195

Answer 2

According to Newton's Second Law of Motion, how much force must be applied to a 0.145 kg baseball for it to travel at 38 m/s²?

A.
F = mv; therefore, it would take 5.5 N of force.

B.
F = mg; therefore, it would take 1.42 N of force.

C.
F = ma; therefore, it would take 5.5 N of force.

D.
F = ma-mg; therefore, it would take 4.0N of force.

Answer 3

i got c

Answer 4

i havent worked on this yet srry

Answer 5

okay

Answer 6

Yes, Newton's second law says F=ma.

Btw, @isuckatschool43 it doesn't hurt to repeat the answer instead of writing the letter (c). It helps you remember the correct information.

Answer 7

okay thanks. i have a couple more. can you help?

Answer 8

@mathmate
A handball player hit a ball with a mass of 0.25 kg. The ball travels at a velocity of 15 m/s for 0.75 s until it hits the wall.

What was the average acceleration of the handball?

A.
20 m/s²

B.
0.05 m/s

C.
20m/s

D.
0.05 m/s²

i got a - 20m/s^2

Answer 9

The question is ambiguous to me.
There is a short instance where the ball accelerates (while in contact with the racket).
The question does not say if the ball was stationary (unlikely) at the beginning, since the average acceleration is different if the ball was travelling towards the racket, or was stationary.

Answer 10

do we have to consider that factor to get the final answer?

Answer 11

Yes, but there is insufficient information.
I know what you have proposed is the \(intended\) answer, although I do not agree with it.

Answer 12

so without this information i will just have to go with the most likely answer

Answer 13

Yes...(reluctantly) lol

Answer 14

lol

Answer 15

i have 3 more i believe

Answer 16

A football player kicks a ball with a mass of 0.42 kg. The average acceleration of the football was 14.8 m/s².

How much force did the kicker supply to the football?

A.
6.22 m/s²

B.
6.22 N

C.
35.24 m/s²

D.
35.24 N

Answer 17

What is your answer?

Answer 18

either c or d

Answer 19

based on what? Newton's second law?

Answer 20

yeah

Answer 21

Do you recall what Newton's second law says?

Answer 22

f=ma

Answer 23

f=ma is correct.

Answer 24

i just retried it and got 6.216

Answer 25

so its b

Answer 26

That is correct!

Answer 27

Sorry, I will have to stop here in case it is a test!

Answer 28

its not it is just a review study guide, checking my answers to make sure i know how to do it right

Answer 29

That's ok, then post the answers to the two remaining questions, I will check them in about half an hour, ok?

Answer 30

okay thanks

Answer 31

If you will post them here, I will bookmark this link.
Otherwise you can pm me or tag me in half an hour.

Answer 32

ill tag you

Answer 33

ok, ttyl!

Answer 34

A 2.5 kg sledge hammer hit a cement block with a force of 6.0 Newtons.

How does the force the sledge hammer exerted on the cement block compare with the force the cement block exerted on the sledge hammer?

A.
The force the sledge hammer exerted on the cement block is equal in magnitude and in the same direction as the force the cement block exerted on the sledge hammer.

B.
The force the sledge hammer exerted on the cement block is greater in magnitude and opposite in direction to the force the cement block exerted on the sledge hammer.

C.
The force the sledge hammer exerted on the cement block is less in magnitude and opposite in direction to the force the cement block exerted on the sledge hammer.

D.
The force the sledge hammer exerted on the cement block is equal in magnitude and opposite in direction to the force the cement block exerted on the sledge hammer.

My answer is D

Answer 35

A bowling ball with a mass of 4.5 kg travels at a velocity of 37 m/s for 2.5 s until it is stopped at the end of the lane by the ball return.

What additional information is required to determine the weight of the bowling ball?

A.
the amount of friction from the bowling lane acting on the bowling ball

B.
the force the bowler applied to the bowling ball

C.
the acceleration due to gravity acting on the bowling ball

D.
the speed at which the ball return captured the ball

My answer is B.

Answer 36

The sledge hammer answer is correct thanks to Newton's third law: action equals reaction (by definition they are in opposite directions).
For the bowling ball question, read-up
http://hyperphysics.phy-astr.gsu.edu/hbase/mass.html

Answer 37

what do i need to be looking for at this site?