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
madreJ [45]
4 years ago
9

A model rocket is launched straight upward with an initial speed of 50.0 m/s. It accelerates with a constant upward acceleration

of 2.00 m/s2 until its engines stop at an altitude of 150 m. Solve the following questions:
(a) What can you say about the motion of the rocket after its engines stop?
(b) What is the maximum height reached by the rocket?
(c) How long after liftoff does the rocket reach its maximum height?
(d) How long is the rocket in the air?
Physics
2 answers:
tamaranim1 [39]4 years ago
8 0
In the question where as a model rocket is launched straight upward with an initial speed of 50.0m/s and it accelerate with a constant acceleration of 2m/s^2 until it engines stop at an altitude od 150. So the following are the answer to your question:
a.The motion, the acceleration was equals to Zero
b.the maximum height is 150m

wolverine [178]4 years ago
5 0

Answer:

Part a)

the rocket will decelerate due to gravity and its speed will start decreasing after that

Part b)

H = 308 m

Part c)

T = 8.5 s

Part d)

T = 16.4 s

Explanation:

Part a)

When Engine stops then the acceleration of the rocket is only due to gravity

So the rocket will decelerate due to gravity and its speed will start decreasing after that

Part b)

final speed of the rocket just before its engine is stopped is given as

v_f^2 - v_i^2 = 2 a d

v_f^2 - 50^2 = 2(2)(150)

v_f = 55.67 m/s

now after this rocket will move under gravity

v_f^2 - v_i^2 = 2a d

0 - 55.67^2 = 2(-9.81)d

d = 158 m

so maximum height from ground is given as

H = 150 + 158 = 308 m

Part c)

Time taken by the rocket to reach 150 m height is given as

v_f = v_i + at

55.67 = 50 + 2t_1

t_1 = 2.835 s

Now after this time to reach the maximum height is given as

0 - 55.67 = -9.81(t_2)

t_2 = 5.67 s

total time is given as

T = 2.835 + 5.67 = 8.5 s

Part d)

Time taken by the rocket to drop back on the surface is given as

y = \frac{1}{2}gt^2

308 = \frac{1}{2}(9.81)t^2

t = 7.92 s

so total time in air

T = 7.92 + 8.5 = 16.4 s

You might be interested in
I need help ASAP....
Svetradugi [14.3K]

Answer:

Meters

Explanation:"How FAR did the athlete run?"

Also it talked about meters

5 0
4 years ago
Name two examples of deposition.
Rashid [163]
The reverse of deposition is sublimation and hence sometimes deposition is called desublimation. One example of deposition is the process by which, in sub-freezing air, water vapor changes directly to ice without first becoming a liquid.
8 0
4 years ago
Read 2 more answers
A crate of 890 kg gets raised to a height of 2.1m. Calculate the crate's gravitational potential energy.​
mars1129 [50]

Answer:

18,316.2

Explanation:

The formula for GPE is mgh, where

M = Mass of the object

G = Acceleration due to gravity (9.8 m/s^2 on Earth)

H = Height above ground

890 × 9.8 × 2.1 = 18,316.2

4 0
3 years ago
Read 2 more answers
If the pressure of a substance is increased during a boiling process, will the temperature also increase, or will it remain cons
7nadin3 [17]

Answer:

on increasing pressure, temperature will also increase.

Explanation:

Considering the ideal gas equation as:

PV=nRT

where,  

P is the pressure

V is the volume

n is the number of moles

T is the temperature  

R is Gas constant having value = 0.0821 L.atm/K.mol

Thus, at constant volume and number of moles, Pressure of the gas is directly proportional to the temperature of  the gas.

P ∝ T

Also,  

Also, using Gay-Lussac's law,

\frac {P_1}{T_1}=\frac {P_2}{T_2}

Thus, on increasing pressure, temperature will also increase.

4 0
3 years ago
To drive a typical car at 40 mph on a level road for one hour requires about 3.2 × 107 J of energy. Suppose we tried to store th
tatiyna

Answer:

9000RPM

Explanation:

"Angular velocity" is directly related to kinetic energy, that is, the Kinetic energy equation would allow an approximation to the resolution investigated in the problem.

The equation for KE is given by:

KE = \frac{1}{2} lw ^ 2

Now, starting from there towards the <em>Angular equation of kinetic energy</em>, the moment of inertia (i) is used instead of mass (m), and angular velocity (w) instead of linear velocity (V)

That's how we get

KE_{Angular} = \frac{1}{2} Iw^2

calculating the inertia for a solid cylindrical disk, of

m = 400kg

r = 1.2 / 2 = 0.6m

I_{disk} = \frac{1}{2} mr^2 = (0.5) (400) (0.6)^2 = 72 kgm^2

We understand that the total kinetic energy is 3.2 * 10 ^ 7J, like this:

3.2*10^7 = \frac{1}{2} Iw^2 = (0.5) (72) w^2 = 36w^2w^2 = 3.2*10^7 / 36 = 0.0888*10^7 = 88.8*10^4

w = 9.43*10^2 = 943 rad / s

Thus,

943 rad / s ≈ 9000 rpm

6 0
3 years ago
Other questions:
  • What is the formula for Impedance for circuit with R, C, and L?
    13·1 answer
  • A plastic tube placed from the ventricles of the brain to the peritoneal cavity in order to continuously remove excess cerebrosp
    8·1 answer
  • 1. Name three branches of<br> science.
    12·1 answer
  • How are electromagnetic waves different than all other waves?
    9·2 answers
  • Can somebody please answer this correctly I will give brainliest
    14·1 answer
  • Which IS considered work:
    15·1 answer
  • Layer T contains a well-known index fossil that is 120 million years old. Layer R contains a different index fossil that is 100
    14·1 answer
  • - When an object is dropped what happens to potential and kinetic energy as it falls?
    15·1 answer
  • .
    7·2 answers
  • The average speed of a plane was 600 km/hr. How long did it take
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!