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3 years ago

11

Suppose a man pushes a crate with a force of 20 N north. What is the magnitude and direction of the reaction force?

1 answer:

Goryan [66]3 years ago

5 0

20 N north because He is pushing it 20 newtons north.

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A joule is used to measure a. power. b. energy. c. torque. d. pressure.

KATRIN_1 [288]

The Joule is the SI unit of energy.

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3 years ago

What is the kinetic energy of 100kg meteor approaching at the speed of 10.0 km/s

Salsk061 [2.6K]

K=?
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4 years ago

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4 years ago

A helium balloon has a radius of 2m. The density of helium of helium is 0.17 kg/m3 and the density of air is 1.25 kg/m3. What is

3241004551 [841]

To solve this problem we will begin by finding the force on each of the elements. For this it will be necessary to obtain the mass, which can be related to density and volume. Finally, by balancing forces it will be possible to obtain the final value of the maximum mass that can be lifted.

By Newton's second law we have,

$F = mg$

Here,

g = Gravitational acceleration

m = mass

At the same time mass can be described as,

$m_1 = \rho \times V$

$m_1 = (1.25)\times \frac{4}{3} (2)^2$

Therefore the Force 1 is,

$F = m_1 g$

$F = \frac{40\pi }{3} (9.8)$

$F = 410.501N$

Applying the same concepto but for the second mass we have,

$m_2 = \rho \times V$

$m_2 = (0.17) \times \frac{3}{4} \pi 2^2$

$m_2 = 5.697kg$

Now by equilibrium we have,

$W + mg = F$

$m = \frac{F+W}{g}$

$m = \frac{410.501-55.828}{9.8}$

$m = 36.19kg$

Therefore the maximum mass lift by balloon is $36.19kg$

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3 years ago

What is the scientific term for rocks formed from lava?

sergeinik [125]

Answer:

extrusive I'm pretty sure that's right

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4 years ago