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ki77a [65]
3 years ago
13

Which of the following are non-contact forces: friction, electrostatic force, magnetic force, gravity?

Physics
2 answers:
oee [108]3 years ago
4 0
Magnetic force and Gravity are non-contact forces among friction, electrostatic force, magnetic force and gravity.
CaHeK987 [17]3 years ago
4 0
Gravity and Magnetic force are non-contact forces 
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What conclusion can be draw about the heat of fusion of water from the heating curve?
PtichkaEL [24]

Answer: C) The kinetic energy and the entropy of the water molecules increases through fusion.

Explanation:

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3 years ago
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If a 20 N block experiences a force of kinetic friction of 8.0 N
shutvik [7]

The coefficient of kinetic friction (μ) between the block and the table is 0.4.

<h3>What is kinetic friction?</h3>

This sis the frictional force between an object in motion with the surface in contact.

μN = ff

where;

  • N is normal reaction due to weight of the block
  • ff is frictional force
  • μ is coefficient of friction

μ = ff/N

μ = 8/20

μ = 0.4

Thus, the coefficient of kinetic friction (μ) between the block and the table is 0.4.

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1 year ago
Is 250 g higher than 100 g in science
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Its the same thing. Is 250 grams more then 100 grams
5 0
3 years ago
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A steel bar of rectangular cross section (1.5 in. 2 3 .0 in.) carries a tensile load P (see fig- ure). The allowable stresses in
lukranit [14]

Explanation:

Value of the cross-sectional area is as follows.

        A = 1.5 \times 2.30

           = 3.45 in^{2}

The given data is as follows.

          Allowable stress = 14,500 psi

          Shear stress = 7100 psi

Now, we will calculate maximum load from allowable stress as follows.

           P_{max} = \sigma_{a}A

                       = 14500 \times 3.45

                       = 50025 lb

Now, maximum load from shear stress is as follows.

           P_{max} = 2 \times \tau_{a} \times A

                      = 2 \times 7100 \times 3.45

                      = 48990 lb

Hence, P_{max} will be calculated as follows.

       P_{max} = min((P_{max})_{\sigma}, (P_{max})_{\tau})

                  = 48990 lb

Thus, we can conclude that the maximum permissible load P_{max} is 48990 lb.

4 0
4 years ago
A motorcyclist changes the velocity of his bike from 20.0 meters/second to 35.0 meters/second under a constant acceleration of 4
Fiesta28 [93]
35-20 = 15m/s difference
15/4 = 3.75 seconds
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3 years ago
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