3 years ago

A glass lying on table doesn't possess friction.why?

Physics

1 answer:

Ratling [72]3 years ago

7 0

Becsud it's not moving

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A person spins a tennis ball on a string in a horizontal circle (so that the axis of rotation is vertical). At the point indicat

Ilya [14]

Answer:

direction does the axis of rotation tilt toward after the blow is the z- direction

Explanation:

This is because

Due to the blow, there is a impulse imparted on the ball which gives a change in linear momentum () in the x direction

Thus When cross product of momentum in x direction is taking with r vector, we will get resultant in z direction. Hence change in angular momentum will be z direction.

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3 years ago

The woman in the first photo lifts a plant 2 m

Serjik [45]

Answer:

65x2=130

that's what she does

8 0

3 years ago

Calculate the pressure exerted on the ground by a boy of a mass 60 kg if he stands on one foot.the area of the sole of his shoe

ddd [48]

Answer:

40 Kpa

Explanation:

150 cm2 = 0.015 m2

$p \: = \frac{mg}{ a} = 40000$

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2 years ago

Can you think of a device or machine that transfers the motion of a hot gas to motion of an object?

tino4ka555 [31]

Answer:

Turbines in coal factories

Explanation:

Turbines in coal factories use steam power to move the turbine flaps and generate static electricity as energy output.

6 0

3 years ago

An amusement park ride consists of airplane-shaped cars attached to steel rods. Each rod has a length of 15m and a cross-section

Oliga [24]

Explanation:

Given that,

Length of each rod, L = 15 m

Area of cross section of the rod, $A=8\ cm^2=0.0008\ m^2$

Young's modulus for steel, $Y=2\times 10^{11}\ Pa$

Total weight of two people, F = 1900 N

We need to find the stretching in the rod when the ride is at rest. The formula of Young's modulus of a material is given by :

$Y=\dfrac{FL}{A\Delta L}$

Here, $\Delta L$ is the stretching in the rod

$\Delta L=\dfrac{FL}{YA}\\\\\Delta L=\dfrac{1900\times 15}{2\times 10^{11}\times 0.0008}\\\\\Delta L=1.78\times 10^{-4}\ m$

So, the rod will stretched to $1.78\times 10^{-4}\ m$

7 0

3 years ago