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777dan777 [17]
3 years ago
6

2. Determine the current in a 120-watt bulb plugged into a 120-volt outlet.

Physics
1 answer:
Sergio039 [100]3 years ago
8 0

Answer:

1 ampere

Explanation:

Power = VI

V = voltage

I = current

Given

Power = 120 watts

V = 120 volts

Therefore

120 = 120 x I

Divide both sides by 120

120/120 = 120/120 x I

1 = I

I = 1 ampere

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Can someone please help me out with this question thanks
IrinaK [193]

Answer:

1.98V

Explanation:

V =IR

V =Voltage

I =Current

R = ResistanceV =IR\\V = 100 (0.0198)\\V = 1.98 volts\\Voltage 1.98V

8 0
3 years ago
Which is not a device for reproducing sound? phonograph MP3 player gramophone microphone
m_a_m_a [10]

Answer:

microphone

Explanation:

3 0
3 years ago
Kyle lays a mirror flat on the floor and aims a laser at the mirror. The laser beam reflects off the mirror and strikes an adjac
Elena L [17]

Answer:

The angle of incidence is  \theta_i  =42.6^o

Explanation:

The diagram for this question is shown on the first uploaded image

From the question we are told that

   The distance between the mirror and the wall is  a = 33.7 cm

    The height of the above the mirror is  b = 36.7 cm

Generally the angle which the reflected ray make with the mirror is mathematically evaluated as

             \alpha  =tan ^{-1} (\frac{b}{a})

substituting values

             \alpha = tan ^{-1}( \frac{36.7}{33.7})

            \alpha =47.4^o

From the diagram we can deduce that  the angle of incidence is

             \theta_i  = 90 - \alpha

So          \theta_i = 90 - 47.4

              \theta_i  =42.6^o

5 0
3 years ago
A golf club exerts an average horizontal force of 1000 n on a 0.045 -kg golf ball that is initially at rest on the tee. the club
OlgaM077 [116]
The impulse (the variation of momentum of the ball) is related to the force applied by
\Delta p = F \Delta t
where \Delta p is the variation of momentum, F is the intensity of the force and \Delta t is the time of application of the force. 
Using F=1000 N and \Delta t = 1.8 ms=1.8 \cdot 10^{-3}s, we can find the variation of momentum:
\Delta p = (1000 N)(1.8 \cdot 10^{-3} s)=1.8 kg m/s

This \Delta p can be rewritten as
\Delta p = p_f - p_i = mv_f - mv_i
where p_f and p_i are the final and initial momentum. But the ball is initially at rest, so the initial momentum is zero, and
\Delta p = mv_f
from which we find the final velocity of the ball:
v_f =  \frac{\Delta p }{m}= \frac{1.8 kg m/s}{0.045 kg}=  40 m/s
8 0
3 years ago
How do you calculate the work done when lifting an object?
vichka [17]
Mass x Gravity x Height
5 0
3 years ago
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