2 years ago

PLLSSSS HELP MARKING BRAINLIST SCIENCE

Physics

1 answer:

Sveta_85 [38]2 years ago

3 0

Answer:

the first one

Explanation: the first one because they were all on two different continents so when they seperated half of the species went on one continent and the other half went onto another one

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An a.c. supply is connected to a wire stretched between the poles of a magnet. Which way does the wire move?

snow_lady [41]

The wire vibrates back and forth between the poles of the magnet.
The frequency of the vibration is the frequency of the AC supply.

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2 years ago

A train travels at a speed of 30 m/s. The train starts at an initial position of 1000 meters and travels for 30 seconds. What is

pychu [463]

1000 + 30x30 = 1900. Hope that helps

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3 years ago

A 50n box is lifted 2 meters in 3 seconds.

anygoal [31]

F=G=50 N

L=F*d=50*2=100 J

is the work

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3 years ago

The tow spring on a car has a spring constant of 3,086 N / m and is initially stretched 18.00 cm by a 100.0 kg college student o

sdas [7]

Answer:

The velocity of the skateboard is 0.774 m/s.

Explanation:

Given that,

The spring constant of the spring, k = 3086 N/m

The spring is stretched 18 cm or 0.18 m

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Potential energy of the spring, $P_f=20\ J$

To find,

The velocity of the car.

Solution,

It is a case of conservation of energy. The total energy of the system remains conserved. So,

$P_i=K_f+P_f$

$\dfrac{1}{2}kx^2=\dfrac{1}{2}mv^2+20$

$\dfrac{1}{2}\times 3086\times (0.18)^2=\dfrac{1}{2}mv^2+20$

$50-20=\dfrac{1}{2}mv^2$

$30=\dfrac{1}{2}mv^2$

$v=\sqrt{\dfrac{60}{100}}$

v = 0.774 m/s

So, the velocity of the skateboard is 0.774 m/s.

7 0

3 years ago

When a falling object reaches terminal velocity, the net force acting on it is

dexar [7]

Pretty sure that it is 0.

3 0

3 years ago