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Helga [31]
2 years ago
14

Select all of the answers that apply. Which of the following make the Earth unique when compared to the other planets in our sol

ar system?
Physics
1 answer:
zalisa [80]2 years ago
7 0
Earth is unique because Earth has gravity and other planets don't.
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Which of these statements best describes how energy is transferred when an object experiences friction?
Slav-nsk [51]
<h2>Answer:</h2><h2> b hopefully this helps you with work </h2>
3 0
2 years ago
LOTS OF POINTSA rocket of mass 40 000 kg takes off and flies to a height of 2.5 km as its engines produce 500 000 N of thrust.
Svetradugi [14.3K]

Answer:

i) E = 269 [MJ]    ii)v = 116 [m/s]

Explanation:

This is a problem that encompasses the work and principle of energy conservation.

In this way, we establish the equation for the principle of conservation and energy.

i)

E_{k1}+W_{1-2}=E_{k2}\\where:\\E_{k1}= kinetic energy at moment 1\\W_{1-2}= work between moments 1 and 2.\\E_{k2}= kinetic energy at moment 2.

W_{1-2}= (F*d) - (m*g*h)\\W_{1-2}=(500000*2.5*10^3)-(40000*9.81*2.5*10^3)\\W_{1-2}= 269*10^6[J] or 269 [MJ]

At that point the speed 1 is equal to zero, since the maximum height achieved was 2.5 [km]. So this calculated work corresponds to the energy of the rocket.

Er = 269*10^6[J]

ii ) With the energy calculated at the previous point, we can calculate the speed developed.

E_{k2}=0.5*m*v^2\\269*10^6=0.5*40000*v^2\\v=\sqrt{\frac{269*10^6}{0.5*40000} }\\ v=116[m/s]

8 0
2 years ago
You are cycling along a flat road.<br> What is the force that is pulling you downwards?
Debora [2.8K]

Answer:Gravity

Explanation:Gravity is the force that pulls everything down instead of up because if we didn’t have gravity we would be floating upwards

7 0
3 years ago
Read 2 more answers
Somebody please help
suter [353]

Answer:

a = 0.1067 [m/s²]

Explanation:

In order to solve this problem, we must first draw a free body diagram with the forces acting on it.

a)

In the attached image we can find the free body diagram.

b)

The net force can be found by performing a sum of forces on the X-axis, these forces are seen in the free body diagram.

∑Fx = Fr

where:

Fr = resultant force [N] (units of Newtons)

F_{r}=275+275-310\\F_{r}=240[N]

c)

Acceleration can be found by means of Newton's second law, which tells us that the sum of the forces in a body or the resulting force is equal to the product of mass by acceleration.

∑F = m*a

where:

m = mass = 2250 [kg]

a = acceleration [m/s²]

240=2250*a\\a=0.1067[m/s^{2} ]

5 0
3 years ago
A block of wood has A mass of 200g give the mass in kg showing long conversion<br>​
anyanavicka [17]

Conversion of mass from grams into kg :

  • 1kg = 1000g

  • 1g =  \dfrac{1}{1000}  \: kg

  • 200g =  \dfrac{200}{1000}  \: kg

  • 200g = 0.2kg
4 0
2 years ago
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