2 years ago

Why are units of measurement useful?

Physics

1 answer:

Lena [83]2 years ago

3 0

Answer:

Explanation:

because the si system does not need to be completed. also the metric system can also.be used

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Based on Newton’s 3rd law if you were to push on the wall with a force of 100 N, how much force would the wall push back towards

rusak2 [61]

The answer is 100N. Look up the definition of Newton's third law.

3 0

3 years ago

The spring constant for the spring in above Table is 20 N/m.

satela [25.4K]

The answer is 0.025J.

W=1/2*k*x^2
W=1/2*20*0.050^2
W=0.025J

5 0

2 years ago

A 20 metric ton train moves toward the south at 50 m/s. At what speed must it travel to have four times its original momentum

OverLord2011 [107]

Answer:

200 m/s

Explanation:

as momentum is a product of mass and speed, and mass is not changing, four times the speed will result in four times the momentum.

p = mv

4p = m(4v)

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2 years ago

A 21 g ball is shot from a spring gun whose spring has a force constant of 579 N/m. The spring can be compressed 1 cm. How high

vodka [1.7K]

Answer:

The answer to the question is

The ball will go 0.14 meters high if the gun is aimed vertically

Explanation:

The energy in the spring → Energy, E = $\frac{1}{2}kx^2$

Where E = energy in the spring

k = Spring constant

x = Spring compression or stretch

Therefore E = $\frac{1}{2} 579*0.01^2 = 0.02895 J$

The spring energy is transferred to the ball as kinetic energy based on the first law of thermodynamics which states that energy is neither created nor destroyed

Kinetic energy = KE = $\frac{1}{2}mv^2$

From which v = $\sqrt{\frac{2*KE}{m} }$ = $\sqrt{\frac{2*0.02895}{0.021} }$ = 1.66 m/s

from v² =u² - 2·a·S

Where v = final velocity = 0 m/s

u = initial velocity = 1.66 m/s

a = g = Acceleration due to gravity

S = height

Therefore 0 = 1.66² - 2×9.81×S

or S = 1.66² ÷ (2×9.81) = 0.14 m

7 0

2 years ago

5. a stone propelled from a catapult with a speed of 50 m/s attains a height of 100m. Calculate

omeli [17]

Answer:

<h3>The answer is 2 s</h3>

Explanation:

The time of flight can be found by using the formula

$t = \frac{d}{v} \\$

d is the distance covered

v is the velocity

From the question we have

$t = \frac{100}{50} = \frac{10}{5} \\$

We have the final answer as

Hope this helps you

8 0

2 years ago