Why does a bullet have more kinetic energy than the recoiling rifle

Answers

Answer 1

Answer: They both have the same momentum, not kinetic energy.

Answer 2

Answer: When bullet is fired it weights let's say 10 grams (0,01 kg) and has velocity of 1000m/s.
The rifle which weights 10000 grams (10kg) has velocity 1 m/s.
The momentum is equal.

But to calculate kinetic energy you have to use formula

Lets calculate:
Bullet's kinetic energy= 1/2*0,01*1000^2 = 5000 J
Rifle's = 1/2*10*1=5 J

So the velocity has much larger impact on kinetic energy than mass.

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The theory of plate tectonics developed in part from an earlier hypothesis about how continents move. What is the name of this earlier hypothesis? A.
continental drift
B.
earthquake development
C.
natural selection
D.
evolution

Answers

I think it maybe A. Continental Drift

its A i know my science

Which of the following best describes a plane?a. The surface of a flat table
B. The edge of a desk
C. A curve in a road
D. The point of intersection of two walls

Answers

From that particular short list, the item that best describes a plane
is the surface a flat table (or of any other flat thing).

-- The edge of a desk is a piece of a straight or curved line.

-- A curve in a road is a piece of a curved line.

-- The intersection of two walls is a piece of a straight line.

The correct answer would be A. The surface of a flat table.

When a wire is made smaller, the resistance increases. Which happens to the electric current?

Answers

Any time the resistance in a circuit increases, for any reason, the
current in the circuit decreases, unless the voltage is increased
to compensate for the greater resistance.

Who Can Help ? Much Love If You Can .Select all that apply.
A convex lens _____.

converges light
bulges in the middle
diverges light
is thinner in the middle

Answers

Answer:

Options C and the D are the correct answer.

Explanation:

There are two types of lenses: concave lenses and convex lenses. A convex lens is thinner in the middle. On the other hand, convex lenses are also called diverging lens because after the light passes through it, the ray light spreads out. Due to this, diverges light and is thinner in the middle are the correct answer.

converges light to a focal point.

What makes a hypothesis testable

Answers

A hypothesis is testable when you can create an experiment to study the proposition contained within the hypothesis. For example, the hypothesis ‘Santa travels slower than a unicorn’ is testable in theory by measuring the speeds of both, but it is not truly testable because neither exists in reality.

Answer:

it must be able to be proved right or wrong - apex

Explanation:

The temperature of a system must increase when heat energy is added true or false?

Answers

False.

In fact, the temperature T of a system is directly proportional to the internal energy U of the system, and the first law of thermodynamics states that the variation of internal energy of a system is given by
$\Delta U = Q-W$
where
Q is the heat added to the system
W is the work done by the system on the surroundings

We see from the formula that we have 2 possible cases:
1) the heat added to the system (Q) is greater than the work done by the system (W) --> $\Delta U$ is positive, this means that the temperature of the system increases
2) the heat added to the system (Q) is less than the work done by the system (W) --> $\Delta U$ is negative, this means that the temperature of the system decreases

Therefore, it's not true that when heat is added to the system, its temperature must increase: it depends on the value of the work done, W. So, the original statement is false.

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Energy of a wave is measured in terms of the wave's ?

Projectile A is launched horizontally at a speed of 20. Meters per second from the top of a cliff and strikes a level surface below, 3.0 seconds later. Projectile B is launched horizontally from the same location at a speed of 30. Meters per second. Approximately how high is the cliff?