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3 years ago

A rock hanging from a string has a net force of zero acting on it ? true or false ?

Physics

1 answer:

sattari [20]3 years ago

8 0

Answer:

true cuase it is true its not false

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Choose the letter of the best description of the nature of light:

Andreas93 [3]

C. Light sometimes behaves like waves and at other times like particles.

6 0

3 years ago

A block of ice at 0 degrees C, whose mass is initially 62 kg, slides along a horizontal surface, starting at a speed of 5.48 m/s

Kryger [21]

The mass of ice melted as a result of friction between the ice and the horizontal surface is 2.78g

Explanation:

Given,

Temperature, T = 0°C

Initial mass, Mi = 62kg

Speed, s = 5.48m/s

Distance, x = 26.8m

Friction is present.

Mass of ice melted = ?

We know,

The amount of energy required for the melting of ice is exactly equal to the initial kinetic energy of the block of ice

and

$Kinetic Energy, KE = \frac{1}{2} mv^2$

Therefore, $KE = \frac{62 X 5.48 X 5.48}{2}$

KE = 930.94 Joules

Ice melting lateral heat is 334 kJ/kg = 334000 J/kg.

Therefore, the melted mass of the ice = 930.94 / 334000 = 0.00278 kg = 2.78 g.

Thus, The mass of ice melted as a result of friction between the ice and the horizontal surface is 2.78g

4 0

3 years ago

A boy is standing motionless on a skateboard. He throws a basketball forward. Describe his motion.

weqwewe [10]

Answer:

Random motion

Explanation:

If the boy throws the basketball forward while at a position on the skateboard, the motion of the ball will be a random motion since we are not told if the ball is moving on a straight line when thrown forward.

In this case, the boy will tend to move in the direction of the ball. Since the ball is moving in a random manner, the motion of the boy will also be a random motion.

A random motion is a motion of a body in a zig zag manner. It is also known as Brownian motion e.g motion of a buzzing mosquito, motion of a smoke coming out of a chimney etc.

8 0

3 years ago

When your food is placed under a warming light in a fast food restaurant, which type of electromagnetic waves are most likely us

8090 [49]

B is the answer i pretty sure...

3 0

3 years ago

Read 2 more answers

What is the Deepest point of the ocean and where is it?

qaws [65]

Answer:

marinas trench in Pacific Ocean