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2 years ago

Rocket can propel itself in a vacuum. True or false

Physics

1 answer:

makkiz [27]2 years ago

3 0

Answer:

Yes.

Explanation:

Rocket can propel itself in vacuum because the thrust is provided as a reaction to the the gases coming out of rocket, which have nothing to do with vacuum.

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A ball is dropped from rest at point O (height unknown). After falling for some time, it passes by a window of height 3 m and it

Usimov [2.4K]

Answer:

Part a)

$\Delta v_{down} = 4.8 m/s$

Part b)

$v_a = 3.71 m/s$

Explanation:

Since ball is dropped under uniform gravity

so here we can say that the distance of 3 m moved by the ball under uniform acceleration is given as

$d = (\frac{v_f + v_i}{2})t$

so we have

$3 = (\frac{v_f + v_i}{2})(0.49)$

$v_f + v_i = 12.24$

also we know that

$v_f - v_i = at$

$v_f - v_i = (9.81)(0.49)$

$v_f - v_i = 4.81$

now we will have

$v_f = 8.52 m/s$

$v_i = 3.71 m/s$

Part a)

$\Delta v_{down} = v_b - v_a$

$\Delta v_{down} = 8.52 - 3.71$

$\Delta v_{down} = 4.8 m/s$

Part b)

speed at the top of the window is

$v_a = 3.71 m/s$

3 0

3 years ago

In terms of energy, think about what happens when you eat a hot meal. Describe all the different forms of energy that you experi

vfiekz [6]

<span>The blackbody radiation of hot food can be felt on the skin in addition to the convective heat over the food. The thermal energy of the food can be felt through conductive heat when the food is touched, either by the hand or the mouth. The chemical energy in the food will be transferred to your body through the digestive system.</span>

3 0

3 years ago

. The p.d. at the terminals of a battery is 25V when no load is connected and 24V when a load taking 10A is connected. Determine

makvit [3.9K]

Answer:

the internal resistance of the cell is 0.1 ohm.

Explanation:

Given;

p.d at the terminals of a battery at no load, E₁ = 25 V

p.d at the terminals of a battery at a load, E₂ = 24 V

current through the circuit, I = 10 A

The potential drop across the circuit, V = E₁ - E₂

= 25 V - 24 V

= 1 V

The internal resistance of the cell is calculated as follows;

r = V/I

r = 1 / 10

r = 0.1 ohm

Therefore, the internal resistance of the cell is 0.1 ohm.

6 0

3 years ago

I WILL REPORT YOU IF YOU ANSWER WITH LINK!!! WILL GIVE BRAINLIEST

mars1129 [50]

Answer:

I think is is

Explanation:

B and C why because i have a gut feeling

8 0

3 years ago

The half-life of carbon-14 is 5370 years. The carbon-14 levels in a fossil indicate that 6 half-lives have passed. How old is th

vodomira [7]

On half life is 5370 years; 6 half lives have passed. You just multiply,

5370*6 = 32,220 years

8 0

3 years ago

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