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storchak [24]
3 years ago
10

Suppose a ball is thrown vertically upwards from a position P above the ground. It rises to the highest point Q and returns to t

he same point P. What is the ball's net displacement and the distance traveled?​
Physics
1 answer:
NikAS [45]3 years ago
5 0

Answer:

Net displacement = 0

Distance traveled = 2PQ <_up and down

Explanation:

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Which is a unit of pressure? A. gram B. Kilopascals C. Newtons D. Kilograms
Finger [1]

B. Kilopascals.

A kilopascal equals to 1,000 pascals; and a pascal is equal to a force of 1 newton per square meter.

Meanwhile,

- a gram and a kilogram are both units of measurement for mass, and

- a newton is a unit of measurement for force.

6 0
3 years ago
Which interaction between x-ray photons and matter results in total absorption of the incident photon?
Leno4ka [110]

Answer:

Photoelectric effect        

Explanation:

In the photoelectric effect, when an x-ray strikes on a metal surface, the energy is completely absorbed by the metal. If the energy would be equal to or more than work function of  metal, electron ejects out. The kinetic energy of the electron which is ejected depends on the energy of the incident radiation and work function of the metal.

4 0
4 years ago
14. A ball initially at rest rolls without slipping
elena-s [515]

Answer:

v = √(10gh/7)

Explanation:

Initial gravitational energy = final rotational energy + kinetic energy

PE = RE + KE

mgh = ½ Iω² + ½ mv²

For a solid sphere, I = ⅖ mr².

For rolling without slipping, ω = v/r.

mgh = ½ (⅖ mr²) (v/r)² + ½ mv²

mgh = ⅕ mv² + ½ mv²

mgh = 7/10 mv²

10/7 gh = v²

v = √(10gh/7)

7 0
3 years ago
A ball moves along a smooth metal surface while an identical ball moves along concrete.
mojhsa [17]

Answer:

2. The metal surface exerts less frictional force because there are fewer bumps and irregularities on it than there are on the concrete.

Explanation:

Frictional force is a force that is exerted between two surfaces in contact with each other. Frictional force always opposes the direction of relative motion of the two surfaces: for instance, for a ball moving along a surface, the force of friction exerted by the surface on the ball points opposite to the direction of motion of the ball.

The magnitude of the frictional force for a ball moving on a flat surface is given by

F=\mu mg

where

\mu is the coefficient of friction

m is the mass of the ball

g is the acceleration of gravity

The value of \mu depends on the type of surface involved. In particular, a smooth surface has a smaller value of \mu, while a rough surface will have a bigger value. In this case, we are comparing a smooth metal surface with concrete: since the metal surface has fewer bumps and irregularities than concrete, it has a smaller value of coefficient of friction, so it exerts less frictional force than concrete.

3 0
3 years ago
Can someone please help me with this.
just olya [345]

Answer:

fast and hard

Explanation:

7 0
3 years ago
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