I need help putting these in the right place!!

A meteorite strikes the Moon at the speed of 11 km/s. It has KE of 60,500,000 J. What will be its mass?

Vikentia [17]

KE=1/2 mv²
60,500,000 = 1/2 m ( 11,000 m/s )²
60,500,000= 1/2 ( 11,000 )² m
60,500,000= 60,500,000 x m
m= 60,500,000/60,500,000
m= 1 kg

8 0

3 years ago

The first A.C. system in the United States was built by _____.

postnew [5]

The first A.C. system in the United States was built by
B. Michael Faraday

4 0

4 years ago

You pull a suitcase along the floor by exerting 43N at an angle. The force of friction is 27 N and the suitcase moves at a const

Mumz [18]

The angle of the force is $51.1^{\circ}$

Explanation:

To solve this problem, we can apply Newton's second law along the horizontal direction of motion of the suitcase:

$\sum F_x = ma_x$

where

$\sum F_x$ is the net force along the x-axis

m is the mass of the suitcase

$a_x$ is the acceleration along the x-axis

The suitcase is moving at constant speed, so the acceleration is zero:

$a_x=0$

Therefore the net force must also be zero:

$\sum F_x = 0$ (1)

We have two forces acting along the horizontal direction:

- The component of the push (forward) in the horizontal direction, $F cos \theta$ , with

F = 43 N

$\theta$ = angle of the force with the horizontal

- The force of friction, $F_f = 27 N$ , backward

So the net force can be written as

$\sum F_x = F cos \theta - F_f$ (2)

Combining (1) and (2),

$F cos \theta - F_f = 0$

And so we can find the angle:

$\theta = cos^{-1}(\frac{F_f}{F})=cos^{-1}(\frac{27}{43})=51.1^{\circ}$

Learn more about Newton's second law:

brainly.com/question/3820012

#LearnwithBrainly

8 0

3 years ago

A shark travels with an average velocity of 12 m/s s. How long (time) would it take the shark to swim 42 m at that velocity

liq [111]

Answer:

<em>t=3.5 seconds</em>

Explanation:

<u>Moving at Constant Speed</u>

Let's suppose and object travels in a constant direction and covers the same distances x at the same time t, we say it has a constant speed. It can be computed as:

$\displaystyle v=\frac{x}{t}$

The time taken to go through the distance x is computed by

$\displaystyle t=\frac{x}{v}$

Our shark moves at v=12 m/s and we need to compute the time it takes to swim x=42 m, so we have

$\displaystyle t=\frac{42}{12}$

$\boxed{t=3.5\ seconds}$

It takes the shark 3.5 seconds to swim 42 m

5 0

4 years ago

What is the purpose of control rods in a nuclear reactor

stellarik [79]

Answer:

Control rods are an important technology for maintaining the desired state of fission reactions within a nuclear reactor. They constitute a real-time control of the fission process, which is crucial for both keeping the fission chain reaction active and preventing it from accelerating beyond control.

Explanation: I hope this help you!!

8 0

3 years ago