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3 years ago

Like electric charges repel each other. Please select the best answer from the choices provided

Physics

2 answers:

alexdok [17]3 years ago

7 0

Like electric charges repel each other. TRUE
I hope this helped :)

g100num [7]3 years ago

3 0

Answer: Option (a) is the correct answer.

Explanation:

It is true that like charges repel each other because their line of force repel each other.

For example, when two positively charged ions are placed together then they tend to repel each other.

Whereas unlike charges attract each other.

For example, when we place a negative charge near a positive charge then the positive charge will readily get attracted to the negative charge because the line of force also attract each other.

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Light travels at a speed of 3.00 x 10^11 cm/s. What is the speed of light in kilometers/hour?

rewona [7]

As 1 km = 1000 m = 1000,00 cm,

So, 1 cm = (1/1000,00) km

1 hour = 60 × 60 s = 3600 s

So, 1 s = (1 / 3600) hour

The light travels at a speed of $3.00 \times 10^{11} \ cm/s$ .

In kilometer/hour,

$3.00 \times 10^{11} \ cm/s = 3.00 \times 10^{11} \frac{(1/1000,00) km}{ (1 / 3600) hour} = 108 \times 10^8 \ km/hour$

4 0

4 years ago

What name is given to the wall of water that makes landfall just ahead of a hurricane?

andreev551 [17]

Pretty sure its a. storm surge

8 0

4 years ago

You are playing ice hockey with friends on a frozen pond. The hockey puck (mass 0.2 kg) is sliding on the ice at 10 m/s when it

chubhunter [2.5K]

Answer:

The mass of the hailstone is $m_2 = 0.05$

Explanation:

From the question we are told that

The mass of the hockey puck is $m_1 = 0.2 \ kg$

The initial speed of the puck is $u_1 = 10 \ m/s$

The final speed of the puck is $v_f = 8 \ m/s$

According to the principles of linear momentum

$m_1u_1 + m_2u_2 = (m_1 + m_2)v_f$

At initial the velocity of the hailstone was zero so

$u_2 = 0 \ m/s$

$m_1 u_1 = (m_1 + m_2 )v_f$

substituting values

$0.2 * 10 = (0.2 + m_2 )* 8$

=> $2 = (0.2 + m_2 )* 8$

=> $0.25 = 0.2 + m_2$

=> $m_2 = 0.05$

6 0

3 years ago

Which option is a force: A. velocity B. acceleration C. mass D. weight

ehidna [41]

Answer:

Explanation:

Weight and force have same derived units

8 0

3 years ago

Approximately how many asteroids that are 0.98 km in radius would it take to make a planet which has a radius of 6420.0 km

maria [59]

Answer:

It'd take approximately 6543 asteroids.

Explanation:

In order to calculate the number of asteroids needed to make that planet we first need to determine the volume of each object. To do this we will consider them as spheres and apply the appropriate formula:

$V_{asteroid} = \frac{4*\pi*0.98}{3} = 4.11 \text{ km}^3$

$V_{planet} = \frac{4*\pi*6420}{3} = 26892.03 \text{ km}^3$

The number of asteroids needed are given by the division of planet's volume by the asteroid's volume.

$n = \frac{26892.03}{4.11} = 6543.07$

It'd take approximately 6543 asteroids.

5 0

4 years ago