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3 years ago

Compare relative age with absolute age.

Physics

1 answer:

oee [108]3 years ago

8 0

Answer & Explanation:

Relative age is the age of a rock layer (or the fossils it contains) compared to other layers. It can be determined by looking at the position of rock layers. Absolute age is the numeric age of a layer of rocks or fossils.

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What units are used to measure force

Nastasia [14]

N, or Neutons are a common way to measure force

5 0

4 years ago

Read 2 more answers

How is the work done to hoist the counterweight related to the potential energy of the counterweight at its specified height?

Nesterboy [21]

Answer:

The work done to lift the counterweight equals the potential energy acquired

Explanation:

since this is vertically applied force on the counterweight, and the distance the force is displacing the counterweight is in the same direction as the applied force, it equals the gained potential energy

3 0

3 years ago

If an object accelerates from rest, with a constant acceleration of 5.4 m/s2, what will its velocity be after 28s?

aleksklad [387]

Vf = Vi + at
Vf = 0 + 5.4•28
= 151.2m/s..
not sure if its right

6 0

3 years ago

A block of mass 5 kg is placed on a rough table having a coefficient of static friction μs = 0.2.What is the force required to m

just olya [345]

Answer:

<em>We need to (at least) apply a force of 9.8 N to move the block</em>

Explanation:

<u>Second Newton's Law</u>

If a net force $F_n$ different from zero is applied to an object of mass m, then it will move at an acceleration a, given by

$F_n=ma$

If we apply a force F to an object placed on a rough surface, the only way to make it move is to beat the friction force which is given by

$F_r=\mu F_N$

Where $\mu$ is the static friction coefficient and $F_N$ is the normal force exerted by the table to the object. Since there is no motion in the vertical direction the normal force equals the weight of the object:

$F_N=mg=5\ kg\ 9.8\ m/s^2=49\ N$

The friction force is

$F_r=0.2 (49)=9.8\ N$

Thus, we need to (at least) apply a force of 9.8 N to move the block

5 0

4 years ago

Problem 1 Two positive point charges are released on a frictionless surface. Which of the following best describes their subsequ

Tatiana [17]

Answer:

(e) The particles move apart with a velocity that increases for a while and then becomes constant.

Explanation:

Each particle feels a repulsive (because they have same sign of charge) electric force from the each other:

$F=\frac{kq_{1}q{2}}{d^{2}}$

and

$F=ma\\$

So each particle feels a repulsive force proportional to the quadratic inverse of the distance.that means that the charges begin to move away, and the further away they are from each other, the force (and therefore the acceleration) decreases, at a rate inversely proportional to the square of the distance. Theoretically this acceleration will never be zero, but in practice it will at some point reach a value very close to zero. Then the speed will grow for a while and when the acceleration has reached almost zero, the speed will practically remain constant.

8 0

4 years ago