All categories

3 years ago

Current can flow through an electric circuit only when the switch is .

Physics

2 answers:

PilotLPTM [1.2K]3 years ago

6 0

Answer:

when the switch is closed

Explanation:

Alika [10]3 years ago

5 0

Current can flow when the switch is closed

You might be interested in

Find the velocity of a baseball thrown 78 m from third base to first base in 30 sec

ankoles [38]

Answer:

V=2.6m/s

Explanation:

velocity=Distance/time

V=78/30=2.6m/s

3 0

2 years ago

What is the weight of an object if the mass is 78 and the gravity is 9.5

zmey [24]

The answer should be 741 N.

W=m*g
9.5*78 is 741

8 0

2 years ago

Two charged spheres are 20 cm apart and exert an attractive force of 8 x 10-9 n on each other. What will the force of attraction

Pavel [41]

Answer:

$3.2\cdot 10^{-8} N$

Explanation:

The inital electrostatic force between the two spheres is given by:

$F=k\frac{q_1 q_2}{r^2}$

where

$F=8\cdot 10^{-9} N$ is the initial force

k is the Coulomb's constant

q1 and q2 are the charges on the two spheres

r is the distance between the two spheres

The problem tells us that the two spheres are moved from a distance of r=20 cm to a distance of r'=10 cm. So we have

$r'=\frac{r}{2}$

Therefore, the new electrostatic force will be

$F'=k\frac{q_1 q_2}{(r')^2}=k\frac{q_1 q_2}{(r/2)^2}=4k\frac{q_1 q_2}{r^2}=4F$

So the force has increased by a factor 4. By using $F=8\cdot 10^{-9} N$ , we find

$F'=4(8\cdot 10^{-9} N)=3.2\cdot 10^{-8} N$

6 0

2 years ago

How does diffraction enable somebody to hear your voice from anywhere in the room?

Vilka [71]

Diffraction means spreading out of waves that has the same wavelength as the size of the gap. Sound waves have high wavelength and so it diffracts\spreads out and enables anyone to hear your voice from anywhere outside the room.

For inside the room, the sound waves doesn't actually diffract. They collide with the air particles, causing a series of compressions and rarefactions which spreads out in the air particles and anyone can hear your voice.

Air is the medium for the sound waves to travel.

4 0

3 years ago

As the distance between two objects decreases, the pull of gravity

aliya0001 [1]

Answer: increases

Explanation:

Because the relationship between hand d is counter

6 0

3 years ago