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3 years ago

Which is an example of an object at rest?

Physics

1 answer:

sammy [17]3 years ago

4 0

Answer:

b. a chair on a floor

Explanation:

All of the other objects are in motion, the jet is flying so it is not at rest, the rabbit is also moving, and a ball hit by a bat is also in motion

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A dart is thrown horizontally at a target's center that is 5.00 m, away. The dart hits the target 0.150 m below the targets cent

boyakko [2]

Answer:

v₀ₓ = 28.6 m / s

Explanation:

This is a missile throwing exercise

y = $v_{oy}$ t - ½ g t²

as the dart is thrown horizontally the vertical velocity is zero (I go = 0)

y = - ½ g t²

t = $\sqrt{- \frac{2y}{g} }$

let's calculate

t = $\sqrt{- \frac{2 \ (-0.150)}{9.8} }$

t = 0.175 s

the expression for horizontal displacement is

x = v₀ₓ t

v₀ₓ = x / t

v₀ₓ = 5.00 / 0.175

v₀ₓ = 28.6 m / s

7 0

3 years ago

Please use this screenshot in any way you can

miskamm [114]

Ball 1 Has uchanging motion because it continually goes up no matter what. Ball 2 has no motion. And ball 3 changing motion because it goes from not moving to moving. Hope this helps

7 0

3 years ago

Calculate the pressure exerted on a surface by a brick of weight 10 N. The area in contact with the surface is 20 cm2

anzhelika [568]

Answer:

Explanation:

Force of brick = 10 N

Area of surface = 20 cm^2

Pressure = force / area

∴ Pressure = 10 / 20

= 1 / 2 or 0.5 Pa

Hope this hepls

plz mark it as brainliest!!!!!!!!

7 0

3 years ago

Read 2 more answers

How can physicists use Newton’s laws of motion and universal gravitation to predict objects’ motion?

koban [17]

Answer:

Newtons law of universal gravitation is the phenomena in which Newton said that every particle in environment will attract other particles in the space.

Explanation:

Newton law of motion and gravitation attract forcefully which is direct proportional to the masses of the particles and inversely proportional to the square of the distances between the centers. Other physicist used Newtons law in research related to motion or to find out the distance between earth and sun. Because this law is about the mass of the objects. When the mas of an object is doubled, the force between the objects get too doubled. When the mass of the two objects is doubled the gravitational pull between these two objects gets doubled. Sir Isaac Newton first gave this law when see fall down an apple from tree.

Formula is : F = G Mm/r2 Here G is gravitational pull that is constant.

5 0

4 years ago

A. The flow of energy from Earth's interior to the surface is about 50 terawatt (1 terawatt = 1e12 joule/sec). This is the energ

alisha [4.7K]

A) The amount of geothermal energy that reaches Earth's surface in one day is : 43.2 * 10¹⁷ joules

B) Humanity's current consumption of energy is; 71.4 GJ per individual.

C) Ratiois ; 60.5 * 10⁶ Joules

<u>Given data :</u>

Amount of energy flow = 50 terawatt = 50*10¹² joule/sec.

<h3>Determine the geothermal energy that reaches the earth</h3>

Since the geothermal energy reaches the earth in a single day

Energy = power * time

Time = 24 hours ( 1 day ) = 86400 secs.

Energy = 50*10¹² joule/sec * 86400 secs

= 43.2 * 10¹⁷ joules

<h3 /><h3>B) Estimating humanity's current consumption of energy in one day.</h3>

Humanity's current consumption of energy in one day is estimated to be 71.4 GJ per individual.

<h3>C) Determine the ratio of geothermal energy to human's current annual consumption </h3>

Geothermal energy / human current annual consumption

= 43.2 * 10¹⁷ Joules / 71.4 * 10⁹ Jolues

= 60.5 * 10⁶ Joules

Hence we can conclude that A) The amount of geothermal energy that reaches Earth's surface in one day is : 43.2 * 10¹⁷ joules

B) Humanity's current consumption of energy is; 71.4 GJ per individual.

C) Ratiois ; 60.5 * 10⁶ Joules

Learn more about Flow of energy : brainly.com/question/14427111

3 0

2 years ago