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3 years ago

1. Gravity is dependent upon mass and distance. True or False

Physics

2 answers:

Gnom [1K]3 years ago

6 0

Answer:

The answer is True

Explanation:

.......

NARA [144]3 years ago

5 0

True, gravity depends directly upon the masses of the 2 objects & the distance between them that’s why planets revolve round the sun & not each other

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A pulse of light takes 3.00 ns to travel through air from an emitter to a detector. When a piece of transparent material with a

cupoosta [38]

Answer:

(a) $1.75\times10^8\text{ m/s}$

(b) 1.71

Explanation:

(a) The difference in the times of travel in the two case = $3.20 - 3.00 = 0.20\text{ ns} = 2.0\times10^{-9}\text{ s}$

This difference is the time in the transparent material. With a thickness of 35.0 cm, the speed in the material is

$v = \dfrac{35 cm}{2.0\times10^{-9}\text{ s}}=\dfrac{0.35 m}{2.0\times10^{-9}\text{ s}} = 1.75\times10^8\text{ m/s}$

(b) The refractive index of the material is the ratio of the velocity of light in vacuum to its velocity in the material. Using speed of light in vacuum as $c = 3.00\times10^8\text{ m/s}$ , the refractive index, $n$ , is

$n=\dfrac{c}{v} = \dfrac{ 3.00\times10^8\text{ m/s}}{1.75\times10^8\text{ m/s}}= 1.71$

4 0

3 years ago

Look at the two wave diagrams. Which best describes the difference between wave A and wave B? Wave A has a greater pitch and fre

stealth61 [152]

Answer:

Correct answer is Wave A has a greater pitch and frequency

Explanation:

To understand the given figure, we should know the definition of wavelength, frequency and pitch

Wavelength

wavelength is defined as distance between two successive wave crests or troughs.

Frequency

Frequency is defined as the number of waves which passes through a given point per second. SI unit of frequency is Hertz.

Pitch

our ear understand the frequency of a sound wave as pitch. A a lower frequency sound has a lower pitch and a higher frequency sound has a higher pitch.

In given figure Wave A has lower wavelength and higher frequency so it have higher pitch than wave B.

4 0

4 years ago

Read 2 more answers

Mathematically, explain how a car (A) with mass of 500 kg and velocity of 2 m/s has the same kinetic energy as a car (B) with ma

scoray [572]

Answer:

Both kinetic energies are equal

Explanation:

Kinetic Energy

Is the type of energy of an object due to its state of motion. It's proportional to the mass and the square of the speed.

The equation for the kinetic energy is:

$\displaystyle K=\frac{1}{2}mv^2$

Where:

m = mass of the object

v = speed of the object

The kinetic energy is expressed in Joules (J)

There are two cars:

Car (A) with mass ma=500 kg and speed va= 2 m/s

Car (B) with mass mb=20,000 gr and speed vb= 10 m/s

Calculate the kinetic energy of both cars:

$\displaystyle K_a=\frac{1}{2}m_av_a^2$

$\displaystyle K_a=\frac{1}{2}500*2^2$

$\displaystyle K_a=250*4=1,000 J$

To calculate the Kb, the mass must be expressed in kg:

mb=20,000/1,000 =20 Kg

$\displaystyle K_b=\frac{1}{2}m_bv_b^2$

$\displaystyle K_b=\frac{1}{2}20*10^2$

$\displaystyle K_b=10*100=1,000 J$

Both kinetic energies are equal

8 0

3 years ago

You lift a bowling ball with your hand, accelerating it upward. What are the forces on the ball and on what objects are they exe

Snowcat [4.5K]

Answer:

Explanation:

When we lift a ball with the hand the forces experienced by the ball is

Force of your hand

Gravitational force

Resultant of these forces gives acceleration to the ball

While your hand exerts a force on the ball, the ball will also exert a force of equal magnitude but opposite in direction to the force by hand.

All these forces is exerted on the ball, hand or on the earth.

7 0

4 years ago

Butter is an example for liquid in solid or solid in liquid

ioda

Answer:

Liquid in solid.

Explanation:

Butter is colloidal in nature belonging to the category of gels. This means that the dispersed phase is liquid and the dispersing medium is solid. In short, butter is an example for liquid in solid.

8 0

3 years ago