1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Kay [80]
3 years ago
7

Calculate the energy in kilowatt hours used by a heater that operates continuously for 30 minutes. The heater has a power rating

of 3000 W.
Physics
1 answer:
maria [59]3 years ago
5 0
3kW X 0.5hours
= 1.5 kWh
You might be interested in
How much equal charge should be placed on the earth and the moon so that the electrical repulsion balances the gravitational for
kumpel [21]

As we know that electrostatic force between two charges is given as

F = \frac{kq_1q_2}{r^2}

here we know that electrostatic repulsion force is balanced by the gravitational force between them

so here force of attraction due to gravitation is given as

F_g = 1.98 \times 10^{20} N

here we can assume that both will have equal charge of magnitude "q"

now we have

1.98 \times 10^{20} = \frac{kq^2}{r^2}

1.98 \times 10^{20} = \frac{(9\times 10^9)(q^2)}{(3.84 \times 10^8)^2}

1.98 \times 10^{20} = (6.10 \times 10^{-8}) q^2

now we have

q = 5.7 \times 10^{13} C

6 0
3 years ago
How does the strong nuclear force hold the nucleus of an atom together?
erastovalidia [21]

The strong nuclear force holds the nucleus of an atom together.  

Somehow, it overcomes the electrical force of repulsion between protons in the nucleus, which all have the same charge but still stay close together somehow. (b)

3 0
3 years ago
Read 2 more answers
How can I become a good science student ?​
iris [78.8K]

Answer:

Study hard , focus on your studies and alyways ask questions .

7 0
2 years ago
Read 2 more answers
Hurry need an answer
notsponge [240]

Answer:

i think b

Explanation:

6 0
3 years ago
In an experiment, a variable, position-dependent force FC) is exerted on a block of mass 1.0 kg that is moving on a horizontal s
marshall27 [118]

Answer:

C) The function F(x) for 0 < x < 5, the block's initial velocity, and the value of Fr.

Explanation:

Yo want to prove the following equation:

W_N=\Delta K\\\\

That is, the net force exerted on an object is equal to the change in the kinetic energy of the object.

The previous equation is also equal to:

F(x)x-F_f=\frac{1}{2}m(v_f^2-v_o^2)    (1)

m: mass of the block

vf: final velocity

v_o: initial velocity

Ff: friction force

F(x): Force

x: distance

You know the values of vf, m and x.

In order to prove the equation (1) it is necessary that you have C The function F(x) for 0 < x < 5, the block's initial velocity, and the value of F.  Thus you can calculate experimentally both sides of the equation.

8 0
2 years ago
Other questions:
  • Which of the following were utilized in romanesque architecture?
    8·2 answers
  • a student pushes a 40 in Block across the floor for a distance of 10 meters how much work was done to move the block A) 4j. B) 4
    5·1 answer
  • What are some non examples of temperature ?
    6·1 answer
  • Elements in an blank or blank of the periodic table have similar characteristics
    15·1 answer
  • What's an impure potassium carbonate
    8·1 answer
  • A racquetball strikes a wall with a speed of 30 m/s and rebounds in the opposite direction with a speed of 26 m/s. The collision
    8·1 answer
  • A plane wave with a wavelength of 500 nm is incident normally ona single slit with a width of 5.0 × 10–6 m.Consider waves that r
    15·1 answer
  • An object is moving across a surface, but it is not gain or lose speed. Which best describes the objects force?
    8·2 answers
  • How are the skeletal and circulatory systems alike?
    12·2 answers
  • Which planet in our solar system, discovered in 1781, was named after the greek god of the sky?.
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!