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2 years ago

Which of the following best describes an action-reaction pair?

2 answers:

3 0

Our weight is greater on the Earth because of its stronger gravity. .... track A? (b) Is the speed gained by ball B going down the extra dip the .... The force of friction between your back foot and the floor pushes you forward. .... (a) Two force pairs act; Earth's pull on the apple (action), and the apple's pull on the ...

Liula [17]2 years ago

3 0

Answer:

The Moon Pulls on Earth, and Earth pulls back on the moon.

Explanation:

Newton's third law of motion describes action and reaction forces. It tells that an object applies an action force on another and another object also exerts a reaction force on the first object. Both the action and reaction forces are of equal magnitude but they act in opposite direction.

Option (A) is an example of action- reaction pair i.e. "The Moon Pulls on Earth, and Earth pulls back on the moon". Earth exerts a gravitational force on the Moon. The gravitational pull of the Earth on the Moon is much more stronger than the pull of Moon on the Earth.

So, the correct option is (A).

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[1] The assembly starts from rest and reaches an angular speed of 150 rev/min under the action of a 20-N force T applied to the

ExtremeBDS [4]

Answer:

t = 5.89 s

Explanation:

To calculate the time, we need the radius of the pulley and the radius of the sphere which was not given in the question.

Let us assume that the radius of the pulley ( $r_p$ ) = 0.4 m

Let the radius of the sphere (r) = 0.5 m

w = angular speed = 150 rev/min = (150 × 2π / 60) rad/s = 15.708 rad/s

Tension (T) = 20 N

mass (m) = 3 kg each

$\int\limits^0_t {Tr_p} \, dt=H_2-H_1\\( Tr_p)t=4rm(rw)\\( Tr_p)t=4r^2mw$

$t = \frac{4r^2mw}{Tr_P}$

Substituting values:

$t = \frac{4r^2mw}{Tr_P}= \frac{4*(0.5)^2*3*15.708}{20*0.4}=5.89s$

7 0

3 years ago

Read 2 more answers

Which layer(s) of Earth participate(s) in plate tectonics? Select all that apply.

mafiozo [28]

I am pretty sure it is A and D

8 0

3 years ago

Read 2 more answers

How does the direction of friction relate to the direction of motion

lesya692 [45]

It reacts to the motion. If the mass hanging from the pulley was overwhelmingly heavier than the mass on the ramp, it'll obviously pull the ramp mass up and thus friction would be trying to oppose this and vice versa.

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2 years ago

Cho hai điện tích q1=q2=8.10^-7 C đặt cách nhau 5cm. Xác định cường độ điện trường tại điểm:

Aleksandr [31]

Answer: b

Explanation:

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2 years ago

Convert the following quantities <img src="https://tex.z-dn.net/?f=25m%20%7B%7D%5E%7B2%7D%20%20%5C%3A%20into%20%5C%3A%20cm%2

Bad White [126]

Answer:

$\rm 250000 \; cm^2$