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
riadik2000 [5.3K]
2 years ago
8

The landing of a spacecraft is cushioned with the help of airbags. During its landing on Mars, the velocity of downward fall is

16 meters/second. Immediately after the impact, the velocity is reduced to 1.2 meters/second. If the spacecraft has a mass of 11.5 × 104 kilograms, what is your estimate for the impulse if the time of impact is 0.8 seconds?
Physics
2 answers:
Svetach [21]2 years ago
7 0

Answer:

-1.7\cdot 10^6 kg m/s

Explanation:

The impulse is equal to the product between the force (F) and the time of impact (\Delta t):

I=F \Delta t

However, the impulse is also equal to the change in momementum of the spacecraft:

I = \Delta p= m (v_f - v_i)

where

m=11.5 \cdot 10^4 kg is the mass of the spacecraft

v_f = 1.2 m/s is the final velocity

v_i = 16 m/s is the initial velocity

Substituting these numbers into the formula, we find

I=(11.5\cdot 10^4 kg)(1.2 m/s-16 m/s)=-1.7\cdot 10^6 kg m/s

where the negative sign simply means that the impulse is in the opposite direction to the motion of the spacecraft (in fact, it makes it slowing down).

maria [59]2 years ago
5 0
You can use the impulse momentum theorem and just subtract the two momenta.
P1 - P2 = (16-1.2)(11.5e4)=1702000Ns
If you first worked out the force and integrated it over time the result is the same
You might be interested in
In one cycle, a heat engine takes in 1000 J of heat from a high-temperature reservoir, releases 600 J of heat to a lower-tempera
Talja [164]

Answer:

η = 40 %  

Explanation:

Given that

Qa ,Heat addition= 1000  J

Qr,Heat rejection= 600 J

Work done ,W= 400 J

We know that ,efficiency of a engine given as

\eta=\dfrac{W(net)}{Q(heat\ addition)}

Now by putting the values in the above equation ,then we get

\eta=\dfrac{400}{1000}

η = 0.4

The efficiency in percentage is given as

η = 0.4  x 100 %

η = 40 %

Therefore the answer will be 40%.

4 0
3 years ago
The following equation is an example of decay?<br><br> 232/90 TH---4/2 HE +228/88 RA?
DaniilM [7]

Answer:

Alpha decay

Explanation:

  • Alpha decay is one of the three major types of decays, others being, beta decay and gamma decay.
  • <em><u>When a radioactive isotope undergoes alpha decay it emits alpha particles. An alpha particle is equivalent to the nucleus of Helium atom.</u></em>
  • <em><u>Therefore, an atom undergoing decay, its atomic mass is decreased by 4 and its atomic number is decreased by 2. </u></em>
  • Thus, since 232/90 Th, has undergone alpha decay its mass number is reduced by 4 to 228 and its atomic number by 2 to 88, and becomes 228/88 Ra.
5 0
2 years ago
On Earth, the gravitational field strength is 10 N/kg. Calculate Ep for a 4 kg bowling ball have that is being held 2 m above th
Soloha48 [4]

Answer:

80 J

Explanation:

Ep = mgh

Ep = (4 kg) (10 m/s²) (2 m)

Ep = 80 J

4 0
3 years ago
Why is earth the only planet on which water exists in a liquid state
Gennadij [26K]
This is due to earths location in the solar system. Earth is in the habitat zone or the Goldie locks zone, in this zone it's not too hot or not too cold for water to exist. Other planets in different star systems have liquid oceans due to them being in the habitat zone.
7 0
3 years ago
Which SI units are combined to describe a force
Keith_Richards [23]

Answer:

C.

Explanation:

kilograms and m/s^2

4 0
2 years ago
Other questions:
  • Plane 1 leaves city A at 7 am and flies at a speed of 250 mph in a straight line towards city B, located 1000 miles North of cit
    8·1 answer
  • Which statement is true?
    12·1 answer
  • The jovian moon with the most geologically active surface is
    13·1 answer
  • Please helps me with this question..
    5·1 answer
  • Blood contains positive and negative ions and therefore is aconductor. A blood vessel, therefore, can be viewed as anelectrical
    11·1 answer
  • Whenever a musician plays a guitar, they pluck one of the guitar strings to produce a standing wave in the string. Then pinch do
    7·1 answer
  • If you are about to be hit from behind, your best course of action is to brake gently and stop the car.
    7·1 answer
  • Bedrock that is closer to oceanic ridges is younger in age than bedrock that is farther away. What can best be concluded from th
    9·1 answer
  • What amount of heat is absorbed by 257 g of water heated from 18° C to 63° C? The specific heat of water is 4.18 J/g°C.
    12·1 answer
  • A steel ring is 50mm diameter and 2mm thick. it must be fitted onto a shaft 50.04 mm diameter. calculate the temperature to whic
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!