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2 years ago

Help plz need the answer

Physics

1 answer:

leva [86]2 years ago

5 0

The mass of the spacecraft is independent of the change of the distance from earth, therefore the mass is the same.

$m_{spacecraft} = 2 \times {10}^{4} kg$

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True or false—If a rock is thrown into the air, the increase in the height would increase the rock’s kinetic energy, and then th

nlexa [21]

I think that this is false but I am not sure

5 0

3 years ago

A 1000-kg car is moving at 40.0 km/hr when the driver slams on the brakes and skids to a stop (with locked brakes) over a distan

liq [111]

Answer:

skid distance = 180 m

Explanation:

given,

mass of the car = 1000 Kg

speed of the car = 40 Km/hr

distance to stop = 20 m

if speed is now = 120 Km/he

distance to stop = ?

from given question we can state that,

Work done by the friction is equal to the change in kinetic energy of the car.

$W= \dfrac{1}{2}mv^2$ ............(1)

And we also know that work is directly proportional to displacement

W = F × x...........................(2)

from the equation (1) and (2)

x ∝ v²

now,

here velocity is increased from 40 km/h to 120 km/h means velocity is increase 3 times

so displacement will be equal to 3² or 9 times

hence, skid distance will be equal to 9 x 20 = 180 m

skid distance = 180 m

8 0

3 years ago

List both chemical equations for photosynthesis and cellular respiration. It is okay to use words for the equations, but you als

iragen [17]

A simple word equation that can be used to describe the process of photosynthesis is carbon dioxide + water —> glucose + oxygen + water. A balanced chemical equation for the process can be written as 6CO2 + 6H2O —> C6H12O6 + 6O2. Overall, photosynthesis uses light energy to convert carbon dioxide into a carbohydrate.

The balanced chemical equation for cellular respiration is C6H12O6 + 6O2 -> 6CO2 + 6H2O, says Biology Web. This does not include the approximate 38 adenosine triphosphates in the equation, according to the Department of Physics and Astronomy at Georgia State University. This is also known as ATP.
<span>CONTINUE READING</span>

7 0

4 years ago

A 2.7-kg block slides with a speed of 1.1 m/s on a frictionless, horizontal surface until it encounters a spring.

IceJOKER [234]

Answer

given,

mass of block = 2.7 kg

speed of block = 1.1 m/s

a) spring compressed to distance of 6 cm or 0.06 m

using conservation of energy

kinetic energy is converted into spring energy

$\dfrac{1}{2}mv^2= \dfrac{1}{2}kx^2$

$k =\dfrac{ mv^2}{x^2}$

$k =\dfrac{2.7\times 1.1^2}{0.06^2}$

k= 907.5 N/m

b) again using conservation of energy

kinetic energy is converted into spring energy

$\dfrac{1}{2}mv^2= \dfrac{1}{2}kx^2$

$v =\sqrt{\dfrac{kx^2}{m}}$

$v=\sqrt{\dfrac{907.5\times 0.015^2}{2.7}}$

$v=\sqrt{0.075625}$

v= 0.275 m/s

8 0

3 years ago

Take an electric field sensor and move it in a straight line, crossing the equipotential lines. Describe the relationship betwee

alex41 [277]

Answer:

E = - dV / dx

Explanation:

The equipotential lines are lines or surfaces that have the same power, therefore we can move in them without carrying out work between equipotential lines, work must be carried out, therefore the electric field changes.

The electric field and the potential are related by

E = - dV / dx

therefore when the change is faster, that is, the equipotential lines are closer, the greater the electric field must be.

4 0

4 years ago