Select all of the statements that are true.

Answers

Answer 1

Answer:

I think its all four of them could be wrong but try all four !!!!!!

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What happens when a blaring siren moves away from you

Answers

It gets quieter as the sound waves have to travel further and so the volume decreases

What can you assume has happened if an electron moves to a higher energy level

Answers

EXPLANATION :

As per the question, the electron has jumped from ground state to higher energy level.

From Bohr's postulate, we know that electron can only move to higher excited state when the energy equivalent to excitation energy has been given to it. Otherwise, the electron can not move from ground state to the excited state.

Hence, it is obvious that the electron might have excited to higher energy level by providing sufficient energy from outside.

The external source might be light of suitable frequency or any electric or thermal source.

A motorboat travels directly east. During its trip, winds blow from directly north, directly south, and southwest. Which of the following statements is true? A. All of the winds do work on the boat. B. Only the north wind does work on the boat. C. Only the south wind does work on the boat. D. Only the southwest wind does work on the boat.

Answers

D. Only the southwest wind does work on the boat. This is because the North and South winds are opposite each other and hence cancel each other out so work is not done.

Why dog pants during summer use the cocept of evaporation

Answers

Every "warm-blooded" living thing needs a way to make heat and keep it
when its body is too cold inside, and a way to get rid of extra heat when
its body is too hot inside.

Moving around (using muscles) makes heat inside, and the animal needs
a way to get rid of the heat. Fast.

Evaporation is a very effective way to get rid of heat.

Human animals do it by perspiring. We excrete moisture through our skin,
and when the moisture evaporates, that takes heat away very efficiently.
That's why we like to fan ourselves when we're hot ... moving more air
past our skin makes moisture evaporate faster.

Dogs don't perspire, so they badly need another way to get rid of heat
in a hurry.

They do it through their mouth. They put water in their mouth if it's available,
or else just collect a lot of saliva in there if there's no other water, and then
they blow air over it to evaporate it and get rid of heat. Panting moves more
air over the moisture, which causes more evaporation and more heat loss.

A constant net torque is applied to a rotating object. Which of the following best describes the object's motion?a. The object will rotate with increasing angular acceleration.
b. The object will have a decreasing moment of inertia.
c. The object will rotate with constant angular velocity.
d. The object will have an increasing moment of inertia.
e. The object will rotate with decreasing angular acceleration.
f. The object will rotate with constant angular acceleration.

Answers

Answer:

f. The object will rotate with constant angular acceleration.

Explanation:

We know that

τ = I α

τ=Torque

I=Moment of inertia of the object

α =Angular acceleration

The moment of inertia is constant for an object and it does not depends on the applied torque.

If applied torque is constant then the angular acceleration of the object will be constant because moment of inertia is constant.

If angular speed is constant then the angular acceleration will,be zero.But in this case object is having angular acceleration that is why it have varying angular speed.

Therefore option "f" is correct.

What equation gives the position at a specific time for an object with constant acceleration?

Answers

Answer:

$x = x_(0)+v_(0)t+(1)/(2)at^(2)$ equation gives the position at a specific time for an object with constant acceleration

Explanation:

$x = x_(0)+v_(0)t+(1)/(2)at^(2)$ equation gives the position at specific time for an object having constant acceleration. Constant acceleration is referred as the change of velocity with respect to the time is known as the acceleration, but when the velocity changes occurs at constant rate this rate is termed as the constant acceleration. The constant acceleration can never be zero. The velocity changes but that change occurs in the consistently. The acceleration is affected by the mass.

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