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3 years ago

3. A.50kg rock is tied on a 1.0m string which has a breaking force of 990N. If the string breaks,

Physics

1 answer:

tamaranim1 [39]3 years ago

8 0

Answer:

The velocity of the stone is , v = 4.45 m/s

Explanation:

Given data,

The mass of the rock, m 50 kg

The length of the string, r = 1.0 m

The breaking force of the string, F = 990 N

If the rotated in a circular motion with the string, the string breaks when the centripetal force exceeds 990 N.

The centripetal force is given by the formula,

F = mv²/ r

∴ v = √(Fr/m)

= √(990 x 1 / 50)

= 4.45 m/s

Hence, the velocity of the stone is , v = 4.45 m/s

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Why is physics considered to be the basic science?.

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2 years ago

A 1750kg bumpercar moving at 1.50m/s to the right collides elastically with a 1450kg car going to the left at 1.10m/s. The 1750k

damaskus [11]

1984.08 kg that’s the answer

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3 years ago

On Earth, 1 kg = 9.8 N = 2.2 lbs. On the Moon, 1 kg = 1.6 N = 0.37 lbs. Use these relationships to answer the following question

romanna [79]

Answer:

(a) 490 N on earth

(b) 80 N on earth

(d) 270.27 kg on moon

Explanation:

We have given 1 kg = 9.8 N = 2.2 lbs on earth

And 1 kg = 1.6 N = 0.37 lbs on moon

(a) We have given mass of the person m = 50 kg

As it is given that 1 kg = 9.8 N

So 50 kg = 50×9.8 =490 N

(b) Mass of the person on moon = 50 kg

As it is given that on moon 1 kg = 1.6 N

So 50 kg = 50×1.6 = 80 N

As it is given that 1 kg = 2.2 lbs on earth

So 100 lbs = 45.4545 kg

(d) We have given weight of the person on moon = 100 lbs

As it is given that 1 kg = 0.37 lbs

So 100 lbs $\frac{100}{0.37}=270.27kg$

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4 years ago

5. Dry ice is an example of _________, which is the process of a solid turning directly into a gas. (1 point) precipitation melt

ki77a [65]

5. Dry ice is an example of _________, which is the process of a solid turning directly into a gas. (1 point)

sublimation

6. The ____ is a unit of force. (1 point)

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100°C

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4 years ago

To sterilize a 53.0 g glass baby bottle, we must raise its temperature from 25.0°C to 92.0°C. How much heat transfer (in J) is r

Stella [2.4K]

The heat energy required is 2983 J

Explanation:

When an amount of energy Q is supplied to a certain sample of substance of mass m, the temperature of the substance increases by an amount of $\Delta T$ according to the equation :