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3 years ago

BRAINLIEST WILL BE MARKED FOR THE FIRST ANSWER

Physics

1 answer:

Andreyy893 years ago

4 0

Answer:

98.4 N

Explanation:

Given that the body weighs 800 N on earth.

Thus,

Weight = mass x acceleration due gravity

i.e W = mg

800 = m x 10

m = $\frac{800}{10}$

= 80 kg

The mass of the body is 80 kg.

To be able to determine its weight on the planet, we have to first calculate the gravitational pull of the planet.

But,

g = $\frac{GM}{r^{2} }$

Where: G is the Newton's universal gravitation, M is the mass of the planet and r is the radius of the planet.

g = $\frac{6.674*10^{-11} *2.986*10^{24} }{(12.742*10^{6})^{2} }$

= $\frac{1.9929*10^{14} }{1.6236*10^{14} }$

= 1.2275

g = 1.23 m/ $s^{2}$

Thus,

Weight of the body on the planet = mg

= 80 x 1.23

= 98.4 N

The weight of the body on the planet is 98.4 N

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charle [14.2K]

As per Newton's law when unbalanced force is acting on the object

$F = ma$

so acceleration of the object is given as

$a = \frac{F}{m}$

since object is accelerating here so we can say that due to unbalanced force there must be change in velocity of the object

So correct answer regarding change in velocity must be given as

3. Decelerate

4. Stop moving

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4 years ago

Which of the following is an example in which you are traveling at constant speed but not at constant velocity?

grin007 [14]

Answer:

c) Driving around in a circle at exactly 100 km/hr.

This examples represents constant speed but not constant velocity.

Explanation:

To answer this question it is importan to know the difference between the concept of speed and velocity.

speed: Is the ratio of change in the displacement per unit of time. JUST A MAGNITUDE

velocity: Is the ratio of change in the displacement per unit of time in a given direction. It is a composed value by magnitude and direction, this is know as a VECTOR.

So, in conclusion the speed is the magnitude or the scalar value, for the velocity vector.

In the example,

in a) Rolling freely down a hill in a cart, traveling in a straight line. There is a component of acceleration, from earth gravity, so the speed is changing.

in b) Driving backward at exactly 50 km/hr. The direction and speed are the same, so speed and velocity are constant.

In d) Jumping up and down, with a period of exactly 60 hops per minute. There are changes in the speed, due to the acceleration and decceleration between the changes in the direction. Actually you have to stop to change direction between the ups and downs in the jumps. Also there is the gravitational component, always changing the speed.

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4 years ago

Whats the measure of the force of gravity on a object

uranmaximum [27]

If it's a small object near another gigantic object, then we usually call that the small object's "weight".

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3 years ago

1.A test rocket is launched vertically from ground level (y = 0 m), at time t = 0.0 s. The rocket engine provides constant upwar

Charra [1.4K]

Answer:

1. t = 3.27 seconds

2. y = 147.3 m

Explanation:

Newton's Laws of Motions.

y = v₁t + 1/2 at²

a = (v₂-v₁)/t

where

y = the vertical distance travelled

v₁ = the initial velocity

v₂ = the final velocity

t = the time

a = the acceleration

final velocity is equal to 0.

So, v₂ = 0.

a = (v₂-v₁)/t

a = (0-30)/t

a = -30/t

plugin values into the first equation:

y = v₁t + 1/2 at²

49 = 30t + 1/2 (-30/t)t²

49 = 30t -15t

49 = 15 t

t = 49/15

t = 3.27 seconds

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a = 9.2

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4 years ago

Arysha enjoys playing lacrosse on the school team. Suppose Arysha throws a lacrosse ball with a force of 6 N, and the resulting

olasank [31]

Answer:

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Explanation:

Given

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Required

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$Force = Mass * Acceleration$

Substitute values for Force and Acceleration

$6N = Mass * 43m/s^2$

Make Mass the subject

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