a ball is dropped from rest at a 80m above the ground. How long does it take for it to reach the ground ?

6.P.2.1 Matter: Properties and Changes Notes

Zinaida [17]

Answer:

The __law__ conservation

of state that either energy may produced nor destroyed

8 0

4 years ago

What is meant by a transverse wave?

lianna [129]

In a transverse wave the particle displacement is perpendicular to the direction of wave propagation. The animation below shows a one-dimensional transverse plane wave propagating from left to right. The particles do not move along with the wave; they simply oscillate up and down about their individual equilibrium positions as the wave passes by. Pick a single particle and watch its motion.

The S waves (Secondary waves) in an earthquake are examples of Transverse waves. S waves propagate with a velocity slower than P waves, arriving several seconds later.

4 0

3 years ago

A 5 kg fish swimming at 1 m/s swallows an absentminded 500 g fish swimming toward it at a veloc- ity that brings both fish to a

morpeh [17]

Answer:

v = 10 m/s

Explanation:

given,

Mass of large fish, M = 5 Kg

speed of swimming, v' = 1 m/s

mass of small fish, m = 500 g = 0.5 Kg

speed of the fish = v

using conservation of momentum

m v + M v' = M u' + m u

final speed of both the speed is zero.

- 0.5 x v + 5 x 1 = 0

negative sign is used because small fish is moving in opposite direction.

now,

0.5 v = 5

v = 10 m/s

hence, the speed of the small fish is equal to 10 m/s.

8 0

3 years ago

A tightly closed, well-insulated vacuum flask is an example of which type of<br> system?

nignag [31]

Answer:

Isolated

Explanation:

4 0

4 years ago

A particle in uniform circular motion requires a net force acting in what direction? Group of answer choices In the direction of

Annette [7]

Answer:

Towards the center of the circle

Explanation:

When an object is moving in uniform circular motion, it means that it is moving at a constant speed in a circular path.

In order to follows a circular path, the particle must have a net force acting on it, that it makes it constantly changing direction - and therefore, causing an acceleration - and this force is called centripetal force.

The direction of this centripetal force is always towards the centre of the circular path.

The nature of the centripetal force is always different, depending on the situation. For instance: for a satellite orbiting the Earth in circular motion, the centripetal force is provided by the force of gravity. For a car moving round a curve, the centripetal force is provided by the force of friction between the tyres and the road.

The magnitude of the centripetal force is given by

$F=m\frac{v^2}{r}$

where

m is the mass of the object

v is its speed

r is the radius of the circle

3 0

3 years ago