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
maksim [4K]
2 years ago
7

12. A rocket, initially at rest on the ground, accelerates vertically. It accelerates uniformly until it

Physics
1 answer:
vodomira [7]2 years ago
5 0

Answer:

We kindly invite you to read carefully the explanation and check the image attached below.

Explanation:

According to this problem, the rocket is accelerated uniformly due to thrust during 30 seconds and after that is decelerated due to gravity. The velocity as function of initial velocity, acceleration and time is:

v_{f} = v_{o}+a\cdot (t-t_{o}) (1)

Where:

v_{o} - Initial velocity, measured in meters per second.

v_{f} - Final velocity, measured in meters per second.

a - Acceleration, measured in meters per square second.

t_{o} - Initial time, measured in seconds.

t - Final time, measured in seconds.

Now we obtain the kinematic equations for thrust and free fall stages:

Thrust (v_{o} = 0\,\frac{m}{s}, a = 30\,\frac{m}{s^{2}}, t_{o} = 0\,s, 0\,s\le t< 30\,s)

v = 30\cdot t (2)

Free fall (v_{o} = 900\,\frac{m}{s}, a = -9.807\,\frac{m}{s}, t_{o} = 30\,s, 30\,s \le t \le 120\,s)

v = 900-9.81\cdot (t-30) (3)

Now we created the graph speed-time, which can be seen below.

You might be interested in
PLEASE HELP
lawyer [7]

I SAID don’t copy from internet but u did

Explanation:

5 0
2 years ago
Which is true about atoms?
tiny-mole [99]

Answer:

A

Explanation:

6 0
2 years ago
Read 2 more answers
RHOOLIOTTO<br> How much mass would be needed to produce 2.7 x 1016 J?
Radda [10]
E = mc^2
m = e/c^2
m = 2.7*10^16/(300000^2)
m = 300000
8 0
3 years ago
A bulldozer and a Mini Cooper are involved in a head-on collision. Which one experiences a greater force
Pepsi [2]

Answer:

The mini Cooper will experience the greater force

Explanation:

Generally, a bulldozer has a greater mass compared to a Mini Cooper hence when both of these vehicles interact in an head on collision the Mini Cooper will experience a greater force because the bulldozer has a greater momentum

5 0
2 years ago
A 10.0-kg mass is placed on a 25.0o incline and friction keeps it from sliding. The coefficient of static friction in this case
vovangra [49]

The frictional force while the mass is sliding will be 46.2 N.

<h3>What is friction force?</h3>

Opposition forces on the surface cause heat loss during the motion of an object known as the friction force.

Given data:

m(mass)= 10.0-kg

Θ (Inclination angle)=25.0o

Coefficient of sliding friction,\rm \mu_k=0.520

Coefficient of static friction,\rm  \mu_s=0.520

The friction force, F=?

Resolve the force in the inclined plane;

\rm F=\mu_s mg cos25^0 \\\\ F=0.520 \times 10 \times 9.81 \times  cos 25 ^0 \\\\ F= 46.2 \ N

Hence, the frictional force while the mass is sliding will be 46.2 N.

To know more about friction force refer to the link;

brainly.com/question/1714663

#SPJ1

5 0
2 years ago
Other questions:
  • How does the kinetic energy of an object affect the speed of an object?
    10·1 answer
  • Object B has a mass of 8 kg and was lifted at a rate of 3 m/s. What is the kinetic energy of object B?
    5·1 answer
  • A sound wave travels through air. The wavelength of the sound wave is equal to the distance between _____. adjacent centers of a
    12·2 answers
  • A hot iron ball is dropped into 200.0 g of cool water. The water temperature increases by 2.0 C and the temperature of the ball
    5·1 answer
  • . Question: 23 of 24:. Which statement is true regarding DC current?. Select one of the options below as your answer:. . A.. The
    14·2 answers
  • How much time does it take a trucker to deliver his shipment 480 km away travelling at an average speed of 120 km/hr?​
    10·1 answer
  • What is the force of a 100 kg car that hits a wall while accelerating at 5 m/s2?​
    5·1 answer
  • An airplane traveling from Atlanta to New York travels 1,395 km in 2.5 h. What is the plane’s average speed?
    8·1 answer
  • PLEASE ANSWER NEED HELP!!!!!!!! PLEASE THE CORRECT ANSWER!!!!!!
    6·2 answers
  • .
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!