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3 years ago

Which statement correctly compares sound and light waves?

Physics

2 answers:

STatiana [176]3 years ago

5 0

Answer:

answer: D (in edg)

Explanation:

jek_recluse [69]3 years ago

4 0

Answer:light waves carry energy parallel to the motion Of The wave, while sound waves carry energy perpendicular to it

Explanation:light waves carry energy parallel to the motion Of The wave while sound waves carry energy perpendicular to it

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When pressing the accelerator on a car, the ___________ energy of the fuel is transformed into the _____________ energy that mak

lesya [120]

B. Chemical; Mechanical

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3 years ago

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This force will cause the path of the particle to curve. Therefore, at a later time, the direction of the force will ___________

melisa1 [442]

Answer:

have a component along the direction of motion that remains perpendicular to the direction of motion

Explanation:

In this exercise you are asked to enter which sentence is correct, let's start by writing Newton's second law.

circular movement

F = m a

a = v² / r

F = m v²/R

where the force is perpendicular to the velocity, all the force is used to change the direction of the velocity

in linear motion

F = m a

where the force is parallel to the acceleration of the body, the total force is used to change the modulus of the velocity

the correct answer is: have a component along the direction of motion that remains perpendicular to the direction of motion

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3 years ago

A stone is dropped from a cliff. after it has fallen 10m what is the stones velocity

Ludmilka [50]

The answer is 14,1421 m/s. :)

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3 years ago

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The force needed to keep a car from skidding on a curve varies inversely as the radius of the curve and jointly as the weight of

motikmotik

Explanation:

It is given that, the force needed to keep a car from skidding on a curve varies inversely as the radius of the curve and jointly as the weight of the car and the square of the car's speed such that,

$F\propto \dfrac{mgv^2}{r}$

$F=\dfrac{kmgv^2}{r}$

mg is the weight of the car

r is the radius of the curve

v is the speed of the car

Case 1.

F = 640 pounds

Weight of the car, W = mg = 2600 pound

Radius of the curve, r = 650 ft

Speed of the car, v = 40 mph

$640=\dfrac{k(2600)(40)^2}{650}$

k = 0.1

Case 2.

Radius of the curve, r = 750 ft

Speed of the car, v = 30 mph

$F=\dfrac{0.1\times 2600\times (30)^2}{750}$

F = 312 N

Hence, this is the required solution.

6 0

3 years ago

An ideal gas in a piston is placed in a refrigerator, which removes 413 J of energy from the gas via cooling. The plunger on the

maria [59]

Answer:

The net change in the internal energy of the gas in the piston is -343J

Explanation:

Because heat and workdone are the only means of energy transfer between the system and the surrounding, change in internal energy is given by;

∆E = q + w

q = heat transfer

w = workdone

Because heat is lost by the system, the heat transfer is negative

q = -413J

Because work is done on the system, workdone is positive

w = +70J

∆E = -413J + 70J

∆E = -343J

5 0

3 years ago