1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
SVETLANKA909090 [29]
3 years ago
11

If a satellite weighs 321 lb. on the earth's surface (R = 4,000 miles), how much does it weigh 12,000 miles above the surface? (

Use only one significant digit in the answer)
Answers:
>20 lb
>40 lb
>80 lb
>100 lb
Physics
1 answer:
Sever21 [200]3 years ago
3 0

The gravitational force between the Earth and the satellite (its "weight") is inversely proportional to the distance between the centers of both objects.

On the surface, their centers are separated by 1 Earth radius.

12,000 miles above the surface, they're separated by 4 Earth radiii.

(4/1) = 4

So after the move, the satellite's weight is (1/4²) = 1/16 of its surface weight.

(321 lb) / (16) = (20 and a hair) lb

The correct choice from the given list is " <em>>20 lb "</em> .  

You might be interested in
What is the main reason why many nuclear power plants are located near bodies of water?
PilotLPTM [1.2K]
The answer is C but man if you have leak or a meltdown good luck to anyone downstream.

6 0
3 years ago
Read 2 more answers
A 6,600 kg train car moving at +2.0 m/s bumps into and locks together with one of mass 5,400 kg moving at -3.0 m/s.
Katarina [22]
Option B would be right one
according to momentum conservation
6600*2 = 13200kgm/s
5400*3 = 16200kgm/s
16200-13200 = 3000
now 6600-5400 = 1200 kg
thus 3000/1200 = 2.5 v
5 0
3 years ago
A ball is thrown at an angle of 38 degrees to the horizontal. What happens to the magnitude of the ball's vertical acceleration
Brut [27]

Answer:

<em>I belive it is 38 degrees</em>

<em />

Explanation:

7 0
2 years ago
Per person, the energy consumption in the United States is about 3.3 × 10^8 Btu/yr. This is equivalent to a power of:________. A
zhuklara [117]

Answer:

3.3\times 10^8\ btu/yr=11\ kW

Explanation:

Btu of British thermal unit is a unit of heat. The relation between btu/year and watts is given by :

1\ btu/yr=3.343\times 10^{-5}\ W\\\\3.3\times 10^8\ btu/yr=3.343\times 10^{-5}\times 3.3\times 10^8\ W\\\\3.3\times 10^8\ btu/yr=11031.9\ W\\\\3.3\times 10^8\ btu/yr=11\ kW

So,  3.3\times 10^8\ btu/yr is equal to 11 kW. Hence, the correct option is (d).                                                                      

4 0
3 years ago
Xavier is roller skating at 14 km/h and tosses a set of keys forward on the ground at 8 km/h. The speed of the keys relative to
Arturiano [62]

Answer:

22 km/h

Explanation:

Given that,

Speed of Xavier, v = 14 km/h

He tosses a set of keys forward on the ground at 8 km/h, v' = 8 km/h

We need to find the speed of the keys relative to the ground. Let it is V.

As both Xavier and the keys are moving in same diretion. The relative speed wrt ground is given by :

V = v+v'

V= 14 + 8

V = 22 km/h

So, the speed of the keys relative to the ground is 22 km/h.

4 0
2 years ago
Other questions:
  • A boat is moving at a rate of 15.0 meters per second. Its speed is then decreased uniformly to 3.0 meters per second. It takes 4
    14·1 answer
  • dam is used to block the passage of a river and to generate electricity. Approximately 58.4 x 103 kg of water falls each second
    9·1 answer
  • A ball of mass 0.152 kg is dropped from a height 2.27 m above the ground. The acceleration of gravity is 9.8 m/s 2 . Neglecting
    7·2 answers
  • What does the word radiation mean
    5·2 answers
  • How does the energy in a system of magnets change when two magnets repel and move away from each other
    12·1 answer
  • EM waves consist of changing electric and magnetic fields moving perpendicular with respect to each other. What kind of wave is
    7·1 answer
  • What is the smallest, most basic level of organization in an animal or<br> plant?
    7·1 answer
  • What happens when an object becomes cold?
    12·1 answer
  • ADHD is triggered ________ by genetic and neurological factors and ________ by social or environmental ones.
    14·1 answer
  • A student wishes to work out how much power she uses to lift her body when climbing a
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!