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yaroslaw [1]
3 years ago
15

A constant net force of 75 N acts on an object initially at rest through a parallel distance of 0.60 m. A) What is the final kin

etic energy of the object?B)If the object has a mass of 0.20kg , what is its final speed?
Physics
1 answer:
nadya68 [22]3 years ago
6 0

Answer

given,

constant net force = 75 N

distance = 0.60 m

mass = 0.20 Kg

a) by work energy theorem work done is equal to change in kinetic energy.

initial speed = 0 m/s

W = KE_f - KE_i

KE_f - 0 = F .s

KE_f = 75 x 0.6

KE_f =45\ J

b) We know.

KE_f =\dfrac{1}{2}mv^2

45=\dfrac{1}{2}\times 0.20 \times v^2

  v² = 450

  v = 21.21 m/s

the final speed of the object is equal to v = 21.21 m/s

   

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Answer:

See Explanation

Explanation:

The density of a substance is an intrinsic property. Intrinsic properties are properties that are characteristic of a material. It does not depend on the amount of substance present.

Since density is an intrinsic or intensive property, If you cut a piece of gold in half, the density of each piece will still be 19.32 g/cm 3 because density does not depend on the size of the gold piece.

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Four identical metallic objects carry the following charges 1.82 6.65 4.80 and 9.30 C The objects are brought simultaneously int
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Answer:

a) 5.64 C

b) 3.5*10¹⁹ protons

Explanation:

a)

  • Since the four metallic objects are identical, and total charge must be conserved, this means that after brought simultaneously into contact so that each touches the others, once separated, total charge must be the same than before being brought in contact.
  • But due they are identical, after charges were able to transfer freely between them, the four objects must have the same final charge, i.e. the fourth part of the total charge, as follows:

       Q_{n} = \frac{Q_{tot}}{4} = \frac{22.57C}{4} = 5.64 C  (1)

b)

  • This charge will be divided between n protons, since the charge is positive.
  • Since each proton carries a charge equal to the elementary charge e, which value is 1.6*10⁻¹⁹ C, we can find the number of protons in excess, doing the following calculation:
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The table represents the speed of a car in a northern
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Answer:

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Answer:

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