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3 years ago

What would most likely cause the future accelaration of the expansion of the univers

1 answer:

6 0

Answer: radiation from the Sun the existence of background radiation the continued existence of dark energy light shifts identified by the Doppler effect.

Explanation:

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Can the kinetic energy of an object be negative? Can the potential energy of an object be negative? Can a potential energy funct

IceJOKER [234]

Answer:

Kinetic energy cannot be negative

potential energy is a reference dependent quantity and it can be positive as well as negative both

Since potential energy is defined only for conservative force so it can not be found for friction force

Explanation:

Kinetic energy of an object is given by the formula

$KE = \frac{1}{2}mv^2$

here we know that

m = mass of object that can not be negative

v = speed of the object and since its square is given here so it can not be negative

so Kinetic energy is always positive

potential energy is given as the energy due to the virtue of the position of object

so it is

$\Delta U = -\int F.dr$

so potential energy is a reference dependent quantity and it can be positive as well as negative both

Since potential energy is defined only for conservative force so it can not be found for friction force

5 0

4 years ago

Why would genetic material need to be able to reproduce

Lynna [10]

So that the next generation could inherit the previous adaptations and instinct and be similar to the parents. if that didn't happen, a cat might give birth to a giraffe

7 0

4 years ago

A person should power walk for minutes a day in order to benefit from this activity

larisa86 [58]

A person should power walk 30-45 min a day

3 0

3 years ago

Read 2 more answers

In this system, ___________________ energy from the sunlight causes the solar panel to create ___________________ energy which f

Alex_Xolod [135]

Answer:

solar, heat,heat, light

5 0

3 years ago

What Is a Sound Wave? Learning Goal: To understand the nature of a sound wave, including its properties: frequency wavelength, l

NISA [10]

Answer:

A) Propagation of pressure fluctuations in a medium

B) air is the medium in which the wave is transported,

Explanation:

Part A.

A sound wave is a longitudinal oscillation of the molecules that forms in a material medium, they can be solid, liquid or gases, therefore the wave propagates in the same direction as the oscillation of the particles.

The most correct answer is:

* Propagation of pressure fluctuations in a medium

Part b

air is the medium in which the wave is transported, otherwise it cannot propagate

8 0

3 years ago