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Georgia [21]
3 years ago
8

If a velocity time graph is horizontal then acceleration is what?

Physics
1 answer:
Alexeev081 [22]3 years ago
4 0

Answer:

Acceleration is zero

Explanation:

if the acceleration is zero, then the velocity-time graph is a horizontal line (i.e., the slope is zero). If the acceleration is positive, then the line is an upward sloping line (i.e., the slope is positive).

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An object from a certain height falls freely. which of the following happens PE and KE when the object is half on its way down​
Leto [7]

Answer:

A. <em>Loses PE and gains KE </em>

Explanation:

Statement is incomplete. Complete statement of problem is:

<em>1. An object from a certain height falls freely. Which of the following happens to PE  and KE when the object is half on its way down? </em>

A. <em>Loses PE and gains KE </em>

B. <em>Gains PE and loses KE </em>

C. <em>Loses both PE and KE </em>

D. <em>Gains both PE and KE​</em>

If we neglect the effects of any conservative force, the application of the Principle of Energy Conservation is reduced to a sum of gravitational potential (U_{g}) and translational kinetic energies, measured in joules. That is:

U_{g,1}+K_{1} =U_{g,2}+K_{2} (Eq. 1)

Let assume that an object falls from a height h with a speed of zero. By definitions of gravitational potential and translational kinetic energies the previous is expanded. If final height is the half of initial value, then:

m\cdot g\cdot h  = 0.5\cdot m\cdot g\cdot h +K_{2} (Eq. 1b)

K_{2} = 0.5\cdot m\cdot g\cdot h

K_{2} = 0.5\cdot U_{g,1}

In a nutshell, translational kinetic energy is increased at the expense of diminishing gravitational potential energy. The correct answer is A.

6 0
4 years ago
A proton carries positive charge, and weights the same as an electron. <br> a. True<br> b. False
ra1l [238]

Answer:

False

Explanation:

The charge on an electron as well as proton is same. The difference between electron and proton is that the electrons have a negative charge while the protons have positive charge.

The weight of an electron is, 9.1\times 10^{-31}\ kg while the weight of a proton is 1.67\times 10^{-27}\ kg.

Therefore, the given statement "A proton carries positive charge, and weights the same as an electron." is false.

4 0
3 years ago
The most abundant element in the universe is:
julsineya [31]
Hydrogen and then its helium
4 0
3 years ago
A physical quantity X is connected from X = ab2/C. Calculate percentage error in X, when percentage error in a,b,c are 4,2 and 3
Hoochie [10]

Answer: 11%

Explanation:

Given that

X = ab^2/C. Calculate percentage error in X, when percentage error in a,b,c are 4,2 and 3 respectively.

Percentage error of b = 2%

Percentage error of b^2 = 2 × 2 = 4

When you are calculating for percentage error that involves multiplication and division, you will always add up the percentage error values.

Percentage error of X will be;

Percentage error of a + percentage error of b^2 + percentage error of c

Substitute for all these values

4 + 4 + 3 = 11%

Therefore, percentage error of X is 11%

3 0
3 years ago
300N effort is applied to lift the load of 900N by using a first class lever. If the distance between the load and fulcrum is 20
Klio2033 [76]

Answer:

Effort=300N

Load=900N

Load distance=20m

Now,

Ed=(L*Ld)/E

Ed=(900*20)/300

Ed=1800/300

Ed=6m

Explanation:

7 0
2 years ago
Read 2 more answers
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