Extremely high temperatures and pressures are necessary for fusion reactions to take place in stars. true or false.

Answers

Answer 1

Answer: That statement stands unique in its simple veracity and truthiness.

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When object A collides with object B and bounces back, its final momentum is ____ its initial momentum.a. greater than
c. in the same direction as
b. less than
d. in the opposite direction of

Answers

When object A collides with object B and bounces back, its final momentum is in the opposite direction of its initial momentum. The correct option among all the options that are given in the question is the last option or option "d". This type of collision is elastic in nature as the ball bounces back and so the momentum has to be in the opposite direction of the initial momentum.

Answer : (D) " in the opposite direction of "

Explanation :

It is given that when object A collides with object B and bounces back. This shows that the collision is elastic. There are two conditions for elastic collision :

(1) The momentum remains conserved

(2) Kinetic energy is conserved.

We know that momentum is defined as the product of mass and velocity. After bouncing back, the direction of velocity gets changed. So, the final momentum is in the opposite direction of its initial momentum.

So, the correct option is (D).

A set of water waves travels at 10.0 m/s, and 4.0 waves pass you in 2.0 s. what is the wavelength of the waves?

Answers

Frequency is the number of waves passing in 1 second. 4 waves passes in 2 sec, so 2 waves will pass in 1 sec. Hence frequency is 2. Wavelength = speed of wave/frequency = 10/2 = 5m. Hence wavelength is 5m.

What is the KE of a bird, mass 40g flying at 23m/s?

Answers

Answer:

230

Explanation:

You do Ke = kinetic times distance divide by mass

Atomic mass unit

a standard unit of mass used for _____ particies

Answers

Answer:

Atomic particle.

Explanation:

It is used to calculate mass at atom level .

1 amu is the mass of 1 atom of C12 carbon

A dog looking for its bone in the yard, first heads 160.0° for 14.0 m and then turns and heads west for 8.50 m.a. What is the magnitude of the dog's displacement?
b. What is the direction of the dog's displacement?