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4 years ago

When is the acceleration of a body is positive, negative and zero?

Physics

2 answers:

lyudmila [28]4 years ago

5 0

Answer:

In vector form , if angle between velocity vector and acceleration vector is less than 90° and greater than 0° then it is positive acceleration and if it is less than 180° and greater than 90° then it is negative acceleration. If there is no acceleration vector then it is called zero acceleration

Explanation:

defon4 years ago

3 0

Answer:

The acceleration is positive when it's in the same direction as that of velocity. It keeps on increasing the velocity. In this case, velocity is not constant.

The acceleration is negative when it is in the direction opposite to that of velocity. It keeps on decreasing the speed of body.

The acceleration is zero when the body moves with a constant velocity in any particular direction.

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The current through a 50ohm's resistance is 2A , how much power is dissipated as heat.

iris [78.8K]

Answer:

Power is 5000 W

Explanation:

${ \bf{P=I {}^{2} R}}$

P is power

I is current

R is resistance

$P=50 {}^{2} \times 2 \\ P=5000{}^{} \: watts$

8 0

3 years ago

Lesechka [4]

The soft iron is a magnetic material hence it became an induced magnet and attracted the blade.

<h3>What is a magnetic substance?</h3>

The term magnetic substances is a substance that can be attracted b a magnet. Now we know that the soft iron is a magnetic material hence it became an induced magnet and attracted the blade.

Recall that a magnetic substance is a substance that can be attracted by a magnet. Wood can not be attracted by a magnet but soft iron cash attracted by a magnet hence it is a magnetic substance.

This is not possible in the case of the wooden block since it is not magnetic as such the the razor blade on the wooden block was attracted to the magnet while the other on the soft iron was not.

Learn more about magnetism:brainly.com/question/2841288

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6 0

2 years ago

Trevor skis down a hill at a speed of 25 m/s. Friction slows him down to a

Burka [1]

Answer:

A. Diagram A

Explanation:

3 0

3 years ago

Find the linear function C Equals=f(F) that gives the reading on the Celsius temperature scale corresponding to a reading on th

Juli2301 [7.4K]

Answer:

a. C(F) = (5/9).F - (160/9)

b. They both readings are equal at C = F = - 40

Explanation:

They are telling us that we are looking for a linear function

If C(F) = a.F + b is the linear function, we use the data to find a and b

C(32) = a.32 + b

0 = a.32 + b

b = - (a.32) (1)

And then

C(212) = a.212 + b

100 = a.212 + b (2)

replacing (1) in (2) we obtain

100 = a.212 + [-(a.32)]

100 = a.212 - a.32

100 = 180.a

a = 100/180

a = 5/9

If a = 5/9 then b = -(a.32)

b = - (5/9).32

b = - (160/9) and the linear function is

C(F) = (5/9).F - (160/9)

For b. they are asking us for a X reading. We must equalize C and F

X = (5/9).X - (160/9)

(4/9).X = - (160/9)

X = -40

C = F at temperature X = - 40

6 0

3 years ago

A truck covers 40.0 m in 7.45 s while uniformly slowing down to a final velocity of 3.50 m/s.

astra-53 [7]

Answer:

(A) Original velocity will be 7.244 m /sec

(B) Acceleration will be $-0.5026m/sec^2$

Explanation:

We have given distance covers by truck s = 40 m

Time taken by truck to cover this distance t = 7.45 sec

Final velocity v = 3.50 sec

According to second equation of motion

$S=ut+\frac{1}{2}at^2$

$40=u\times 7.45+\frac{1}{2}\times a\times 7.45^2$

$7.45u+27.751a=40$ -----eqn 1

According to first equation of motion

v = u + at

So $3.5=u+7.45a$ -----eqn2

Solving equation 1 and 2

a = $-0.5026m/sec^2$

And u = 7.244 m /sec

(A) Original velocity will be 7.244 m /sec

(B) Acceleration will be

$-0.5026m/sec^2$

6 0

4 years ago