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ch4aika [34]
3 years ago
6

Can someone help me??? PLZ. ASAP. TODAY!!!!! Only number 1#1

Physics
1 answer:
il63 [147K]3 years ago
4 0
The answer is letter a
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A heater marked 2000W/3000W is switched on for 4 hours. For the first hour it is on the highest setting and for the last 3 hours
Leni [432]

Answer:

9 kW-hr

Explanation:

3000 W  = 3 kW          for 1 hr =    <u>3 kW - hr </u>

2000 W  = 2 kW          for 3 hr =  <u> 6 kW -hr</u>

<u />

total power =  <u> 3 + 6 = 9 kW-hr</u>

3 0
2 years ago
Which objects will likely have the greatest gravitational force between them?
Mariulka [41]

Answer:

d. Two soccer balls that are touching each other

Explanation:

Let m_1 be the mass of a tennis ball, m_2 is the mass of a soccer ball.

As the mass of a soccer ball is more than the mass of a tennis ball, so

m_2 > m_1

Let d_1 be the distance between the centers of both the balls near each other and d_2 be the distance between the centers of both the balls touching each other.

So, d_2 > d_1

The gravitational force, F, between the two objects having masses M and m and separated by distance d is

F=\frac{GMm}{d^2}

Where G is the universal gravitational constant.

As, the gravitational force is directly proportional to the product of both the masses and inversely proportional to the square of the distance between them,  so selecting the larger mass (m_2, soccer ball) separated by a lesser distance (d_2, touching) to get more gravitational force.

Therefore, there will be a larger gravitational force between them when two soccer balls touching each other.

Hence, option (d) is correct.

3 0
3 years ago
La pregunta dice asi: de las acciones politicas que pone como ejemplo norberto bobbio, elija una y expliquela
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Quisiera ayudarte pero no puedo apenas voy a pasar a secundaria :(

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What is the independent variable?<br> Plants will grow more when the day is longer.
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Answer:

The independent variable is the day because the plants growth depnds on how long the day is. PLEASE VOTE THIS ANSWER BRAINLIEST PLEASE!!!!!!!!!!!!!!!!!!!!!!!!!

Explanation:

5 0
3 years ago
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Which of the following statements is true?
vekshin1
Your answer is D I took this test
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3 years ago
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