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
Nonamiya [84]
3 years ago
8

A rocket engine applies a thrust for e fo 450N for 15s. The 2800Kg rocket is travelling 690 m/s before the engine thrust. What i

s the final velocity of the rocket?
Physics
1 answer:
stepan [7]3 years ago
7 0

Answer:

692.4m/s

Explanation:

According to Newton's second law;

F = ma

F = m(v-u)/t

m is the mass

v is the final velocity

u is the initial velocity

t is the time

F is the forcr

Given

F = 450N

m = 2800kg

u =690m/s

t =15s

v = ?

Substitute into the formula

450 = 2800(v-690)/15

450×15 = 2800(v-690)

6750 = 2800(v-690)

6750/2800 =v-690

2.4 = v-690

v = 690+2.4

v = 692.4m/s

Hence the final velocity is 692.4m/s

You might be interested in
Sun *
Ludmilka [50]

Answer:

E

Explanation:

6 0
3 years ago
Estefan has determined his BMI at 31. Explain how he can apply the FITT training principles to improve his body composition.
-BARSIC- [3]
Frequency:

Cardio : Five or more 
HIIT: 5 or 4

Strength: 2-3 days on non-consecutive days a week
 
Intensity:
How hard you work during the session

For cardio : workout at your target heart rate.
For HIIT: varying intensity from high to low or rest ( no slow pace)
For strength: you should lift enough weight to complete the needed number of reps and sets.

Time:

For cardio 30- 60 min
For HIIT 45 min (short periods of bursts followed by rest)

For strength depends on the amount of weight.

Type:

Either cardio, HIIT or strength training (resistance training) 

NOTE: This info is given by an unqualified brofessor, who uses his hard gained bro-science in the expense of scientific facts to solve others broblems. 



7 0
4 years ago
Ingrid says that a red ball of clay appears red because the clay reflects red wavelengths. Simon says that the clay appears red
galina1969 [7]

Answer: (A) Ingrid is incorrect. The clay appears red because it reflects red wavelengths.

Explanation:

Edge 2021

3 0
3 years ago
Read 2 more answers
Suppose that a ball decelerates from 8.0 m/s to a stop as it rolls up a hill, losing 10% of its kinetic energy to friction. Dete
katrin2010 [14]

Answer:

The maximum height is 0.33 m.

Explanation:

initial velocity, u = 8 m/s

final velocity, v = 0 m/s

10% of  kinetic energy is lost in friction.

The kinetic energy used to move up the top,

KE = 10 % of 0.5 mv^2

KE = 0.1 x 0.5 x m x 8 x 8 = 3.2 m

Let the maximum height is h.

Use conservation of energy

KE at the bottom = PE at the top

3.2 m = m x 9.8 x h

h = 0.33 m  

4 0
3 years ago
Vygotsky believed that scaffolding limited communication between the teacher and the learner.
spin [16.1K]

Answer: The given statement is False.

Lev Vygotsky gave a socio-cultural theory of cognitive development. According to this theory, socialization or social interaction of individual with people who are more knowledgeable than them plays a significant role in their cognitive development.

He described scaffolding as the support given to child by more knowledgeable others ( like parents or teachers). This means that scaffolding allowed communication between the teacher and the learner.

Thus, the given statement is False.

4 0
4 years ago
Read 2 more answers
Other questions:
  • Practice physics chapter 3 grade 11 test
    5·1 answer
  • A runner runs 4875 ft in 6.85 minutes. what is the runnerâs average speed in miles per hour?
    11·1 answer
  • A particle is moving along the x-axis so that its position at any time t is greater than and equal to 0 is given by x(t)=2te^-t?
    8·1 answer
  • What happens when you split a hydrogen atom?
    10·2 answers
  • Question 1: A man trailing a trolley bag and suddenly, the wheels of the trolley bag get locked. The man realises that he has to
    15·1 answer
  • During combustion reactions, explain why the energy of the reactants must exceed the total energy of the products​
    6·1 answer
  • PLEASE help its timed..
    5·1 answer
  • What is the velocity of the girl in Figure b? Please help me!!!!<br> Is the answer A,B,C,D,E, or F?
    5·1 answer
  • Identify the y-intercept.
    13·2 answers
  • What are the 7 electromagnetic waves in order from lowest to highest wavelength?
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!