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Mazyrski [523]
3 years ago
15

A night lamp uses a 30 W bulb. If it is left on continuously for 8 hours, how much energy will it use?

Physics
2 answers:
den301095 [7]3 years ago
6 0

Answer:

Explanation:

30W * 8 h = 240 Wh = 0.240 kWh

bezimeni [28]3 years ago
4 0

Answer:

0.24 kWh

Explanation:

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2) If the initial velocity of an object is equal to a final velocity, what is the acceleration of the object?
Arlecino [84]

Answer:

The acceleration is 0.

Explanation:

The formula for acceleration is:

a = (v-u)/t

If v and u are equal, thus it would be 0 when subtracted, and anything divided by 0 is 0.

8 0
3 years ago
Two objects have the same momentum. Do the velocities of these objects necessarily have (a) the same directions and (b) the same
NeX [460]

Answer:

(a) They must have same direction

(b) It is not necessary for them to have same magnitudes

Explanation:

(a)

Momentum is a vector quantity. It is the product of mass (scalar) and velocity (vector). Thus, if the direction of velocity is changed, then as a result the direction of momentum will also change or its magnitude or component in the same direction will change. Hence, for the two objects to have same momentum, the directions of their velocities must also be the same.

(b)

Since, the momentum is product of velocity and mass. It is possible that two bodies of different masses with different velocities might have same momentum, provided the direction of their velocities is same.

For example, take a body of mass 4 kg moving with speed 5 m/s. It will have a momentum of 20 N.s. Now, consider another body of mass 2 kg, moving with speed 10 m/s. It will also have a momentum of 20 N.s.

Thus, it is not necessary for two objects to have same magnitude of velocity to have same momentum.

3 0
3 years ago
A space traveler discovers that her weight on a new planet is 192 newtons. Her mass is 68 kilograms. What is the gravitational a
alina1380 [7]

Answer:

g ≈ 2.82 m/s^2

Explanation:

By W = mg,

W = weight (in newtons)

m = mass (in kg)

g = gravitational acceleration (in m/s^2)

192 = 68g

g = 2.82352941176 m/s^2

g ≈ 2.82 m/s^2

3 0
2 years ago
If the amplitude of the waves coming from a light bulb decreased, which would you expect to happen?
jekas [21]
The amplitude of the electromagnetic waves coming from
a light bulb is exactly an indication of the energy carried by
the waves. 

If their amplitude decreases, then the waves are carrying less
energy.  The brightness of the light decreases, AND the bulb
runs cooler, because it produces less heat.
4 0
3 years ago
Read 2 more answers
Why does the comet have tails
docker41 [41]

Answer:

Comets leave long beautiful tails when they come close to the sun. ... But when it approaches the sun, the heat evaporates the comet's gases, causing it to emit dust and microparticles (electrons and ions). These materials form a tail whose flow is affected by the sun's radiation pressure.

Explanation: I just searched it up on the internet lol.

8 0
3 years ago
Read 2 more answers
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