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3 years ago

Which of the following statements is correct.

Physics

1 answer:

tekilochka [14]3 years ago

6 0

The answer is C, as the frequency gets higher the wavelength gets shorter

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A puppy is running with a speed of 11.2 m/s towards it owner when it

Levart [38]

Answer:

-5.6m/s²

Explanation:

Given parameters:

Initial speed = 11.2m/s

Time of running = 2s

Unknown:

Acceleration of the puppy = ?

Solution:

Acceleration is the rate of change of velocity with time.

So;

Acceleration = $\frac{Final speed - initial speed }{time}$

final speed = 0m/s

Acceleration = $\frac{0 - 11.2}{2}$ = -5.6m/s²

8 0

3 years ago

Which of the following is a scalar quantity?

zhenek [66]

Answer:

The answer is C

Explanation:

Scalar is a quantity that has magnitude but without direction.

So in this case, option A, B and D is a vector.

8 0

4 years ago

Answers the following questions in brie. State any two properties of a bar magnet

natta225 [31]

Answer:

north pole and south pole

Explanation:

it has two magnetic poles

6 0

3 years ago

The 8 kg block is then released and accelerates to the right, toward the 2 kg block. The surface is rough and the coefficient of

natita [175]

Answer:

3.258 m/s

Explanation:

k = Spring constant = 263 N/m (Assumed, as it is not given)

x = Displacement of spring = 0.7 m (Assumed, as it is not given)

$\mu$ = Coefficient of friction = 0.4

Energy stored in spring is given by

$U=\dfrac{1}{2}kx^2\\\Rightarrow U=\dfrac{1}{2}\times 263\times 0.7^2\\\Rightarrow U=64.435\ J$

As the energy in the system is conserved we have

$\dfrac{1}{2}mv^2=U-\mu mgx\\\Rightarrow v=\sqrt{2\dfrac{U-\mu mgx}{m}}\\\Rightarrow v=\sqrt{2\dfrac{64.435-0.4\times 8\times 9.81\times 0.7}{8}}\\\Rightarrow v=3.258\ m/s$

The speed of the 8 kg block just before collision is 3.258 m/s

7 0

3 years ago

Torque is the rotational quantity most closely related to the linear quantity

jek_recluse [69]

Answer:

The definition of torque states that one or both of the angular velocity or the moment of inertia of an object are changing.

Velocity and momentum

Explanation:

4 0

3 years ago