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3 years ago

I need help ASAP 8th GRADE SCIENCE

Physics

2 answers:

vaieri [72.5K]3 years ago

4 0

Answer:

The answer is gravitational force

Explanation:

elena-14-01-66 [18.8K]3 years ago

3 0

Answer:

its D. i hope this helps good luck please thank and name brainly

Explanation:

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what is the magnitude of the compression forces (assumed to be horizontal) acting on both sides of the center board that is sand

Len [333]

F = normal force by each board on each side

W = weight of the board in between acting in down direction = 95.5 N

f = frictional force in upward direction by each board

$\mu$ = coefficient of friction = 0.663

Using equilibrium of force in Upward direction

f + f = W

f = W/2

f = 95.5/2 = 47.75 N

frictional force is given as

f = $\mu$ F

47.75 = (0.663) F

F = 72.02 N

4 0

3 years ago

A train is traveling at a speed of 75km/hr. The brakes are applied to produce a uniform acceleration of -0.5 m/s2.Find how far t

NNADVOKAT [17]

Answer:

your answer would be 21m

Explanation:

7 0

3 years ago

A box rests on the back of a truck. The coefficient of friction between the box and the surface is 0.32. (3 marks) a. When the t

cricket20 [7]

Answer:

Part a)

here friction force will accelerate the box in forward direction

Part b)

a = 3.14 m/s/s

Explanation:

Part a)

When truck accelerates forward direction then the box placed on the truck will also move with the truck in same direction

Here if they both moves together with same acceleration then the force on the box is due to friction force between the box and the surface of the truck

So here friction force will accelerate the box in forward direction

Part b)

The maximum value of friction force on the box is known as limiting friction

it is given by the formula

$F = \mu mg$

so we have

$F = ma = \mu mg$

now the acceleration is given as

$a = \mu g$

$a = (0.32)(9.8) = 3.14 m/s^2$

5 0

3 years ago

An engine manufacturer makes the claim that the engine they have developed will, on each cycle, take 100J of heat out of boiling

Alborosie

Answer:

Explanation:

Intake heat, QH = 100 J

output heat, Qc = 20 J

Work, W = 80 J

TH = 100°C = 373 K

Tc = 10°C = 283 K

TH/ Tc = 373 / 283 = 1.318

QH/Qc = 100 / 20 = 5

for a heat engine, those ratios should be same. so temperature is not correct.

4 0

4 years ago

This spectrometer reading shows some red, blue, and purple. Our atom is most likely ______________________.

Kisachek [45]

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This spectrometer reading shows some red, yellow, and blue. Our atom is most likely Helium source.

This spectrometer reading shows some yellow, blue, and purple. Our atom is most likely Mercury source</span>

7 0

3 years ago