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
elena-s [515]
3 years ago
13

What is the danger to spacecraft and astronauts from micrometeoroids?

Physics
1 answer:
Sloan [31]3 years ago
7 0

Answer:

Suppose the micrometeoroid weighed 1 g = .001 kg

Suppose also the spacecraft were moving at 18,000 mph (1.5 hrs per rev)

Usually, the smaller particle would be moving but for simplicity suppose that it were stationary wrt the ground

v = 18000 miles / hr * 1500 m/mile / 3600 sec/hr = 7500 m/s

KE = 1/2 * .001 kg * (7500 m)^2 = 28,125 Joules

One can see that 28000 Joules could be damaging amount of energy

You might be interested in
Which type of reaction is shown here? 2KClO3 + heat —> 2KCl + 302 endothermic reaction exothermic reaction
melamori03 [73]
The answer is "A" Endothermic. Hope that helped :)
7 0
3 years ago
1 hp is equal to? What is the answer​
rewona [7]
The electrical equivalent of one horsepower is 746 watts in the International System of Units (SI), and the heat equivalent is 2,545 BTU (British Thermal Units) per hour. Another unit of power is the metric horsepower, which equals 4,500 kilogram-metres per minute (32,549 foot-pounds per minute), or 0.9863 horsepower.
5 0
2 years ago
Which method of heat transfer takes place when particles of matter vibrate and collide with each other in direct contact
Cerrena [4.2K]
Conduction, hope this helps! :)
6 0
3 years ago
Read 2 more answers
Justify why does a bird flap its wing to fly higher??​
SpyIntel [72]

Answer:

they use thermals and air currents to glide.

Explanation:

when they flap higher they use thermals and air currents  because flapping takes a lot of fuel,energy

8 0
3 years ago
The voltage across the terminals of a generator is 5.7 v when it supplies a current of 0.3 A. It becomes 5.1 V when I=0.9A. Find
snow_tiger [21]

Answer:

  • The emf of the generator is 6V
  • The internal resistance of the generator is 1 Ω

Explanation:

Given;

terminal voltage, V = 5.7 V, when the current, I = 0.3 A

terminal voltage, V = 5.1 V, when the current, I = 0.9 A

The emf of the generator is calculated as;

E = V + Ir

where;

E is the emf of the generator

r is the internal resistance

First case:

E = 5.7   + 0.3r -------- (1)

Second case:

E = 5.1 + 0.9r -------- (2)

Since the emf E, is constant in both equations, we will have the following;

5.1 + 0.9r = 5.7   + 0.3r  

collect similar terms together;

0.9r - 0.3r = 5.7 - 5.1

0.6r = 0.6

r = 0.6/0.6

r = 1 Ω

Now, determine the emf of the generator;

E = V + Ir

E = 5.1 + 0.9x1

E = 5.1 + 0.9

E = 6 V

6 0
2 years ago
Other questions:
  • Mary takes 6.0 seconds to run up a flight of stairs that is 102 meters long. If Mary's weight is 87 newtons, what power has Mary
    12·1 answer
  • The chief by 3 3/4 kg of Apple's 7 1/4 kilograms of peers and 10 1/8 kilograms with orange about how many kilograms of fruit did
    7·2 answers
  • in a given chemical reaction the energy of the products is greater than the energy of the reactants this is because
    12·1 answer
  • Which types of electromagnetic waves have frequencies that are higher than those of ultraviolet light but lower than those of ga
    14·2 answers
  • The value of a scientific variable ____. A) can change
    14·2 answers
  • While listening to operatic solos, musicians process the lyrics and the tunes in separate brain areas. This most clearly illustr
    9·1 answer
  • Which of the following is the best example of kinetic energy? A book sitting on a bookshelf A golfer preparing to putt the ball
    14·2 answers
  • 8 colors according to their alphabetical order​
    10·1 answer
  • Potential energy question
    13·1 answer
  • This is written question
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!