Ask question

Ask question

All categories

3 years ago

14

20 POINTS

1 answer:

Fantom [35]3 years ago

5 0

I think it’s the first one- maximise the mass

You might be interested in

Consider a rocket that is in deep space and at rest relative to an inertial reference frame. The rocket's engine is to be fired

ValentinkaMS [17]

Answer:

$\frac{m_i}{m_f}=2.7182$

$\frac{m_i}{m_f}=1096.633$

Explanation:

$m_i$ = Initial mass of rocket

$m_f$ = Final mass of rocket

u = Initial velocity

$v_r$ = Relative velocity

v = Velocity

From the rocket equation

$v=u+v_{r}\ln {\frac {m_{i}}{m_{f}}}\\\Rightarrow v=v_{r}\ln {\frac {m_{i}}{m_{f}}}\\\Rightarrow \frac{m_i}{m_f}=e^{\frac{v}{v_{r}}}\\\Rightarrow \frac{m_i}{m_f}=e^{\frac{v}{v}}=e^1\\\Rightarrow \frac{m_i}{m_f}=2.7182$

$\frac{m_i}{m_f}=2.7182$

when $v=7v_r$

$v=v_{r}\ln {\frac {m_{i}}{m_{f}}}\\\Rightarrow \frac{m_i}{m_f}=e^{\frac{v}{v_{r}}}\\\Rightarrow \frac{m_i}{m_f}=e^{\frac{7v_r}{v_r}}=e^7\\\Rightarrow \frac{m_i}{m_f}=1096.633$

$\frac{m_i}{m_f}=1096.633$

6 0

3 years ago

A painter sits on a scaffold that is connected to a rope passing over a pulley. The other end of the rope rests in the hands of

Doss [256]

Solution :

a). From Newtons second law,

F = ma

The total tension force is 2T.

∴ 2T - (m + M)g = (m+ M)a

Then

$a=\frac{2T-(m+M)g}{m+M}$

$a=\frac{2\times 600-(52+63)9.8}{52+63}$

$=0.63 \ m/s^2$

b). From the person,

F = ma

T - Mg + N = Ma

or N = Ma + Mg - T

= (63 x 9.8) + (52 x 9.8) - 600

= 617.4 + 509.6 - 600

= 527 N

6 0

3 years ago

When a vapor condenses to a liquid, an amount of thermal energy (Q

mina [271]

Answer:

true

Explanation:

I did this unit for science

6 0

3 years ago

Two resistors, of R1 = 3.93 Ω and R2 = 5.59 Ω, are connected in series to a battery with an EMF of 24.0 V and negligible interna

son4ous [18]

Answer:

2.521 (A); 14.0924 (V)

Explanation:

more info in the attachment, the answers are marked with red colour.

4 0

3 years ago

If you have 3/4 cup of flour how many eights do you have

BabaBlast [244]

I think it's 6/8, you multiply by 2. 3/4 x 2 = 6/8.

7 0

4 years ago

Read 2 more answers