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2 years ago

How is a reference point defined?

1 answer:

6 0

Simply be used as a reference point <span>to describe its position. a fact forming the basis of an evaluation or assessment; criterion. They had few cultural </span>reference points<span> in common.</span>

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A 6.89-nC charge is located 1.76 m from a 4.10-nC point charge. (a) Find the magnitude of the electrostatic force that one charg

iogann1982 [59]

Answer: a) 8.2 * 10^-8 N or 82 nN and b) is repulsive

Explanation: To solve this problem we have to use the Coulomb force for two point charged, it is given by:

$F=\frac{k*q1*q2}{d^{2}}$

Replacing the dat we obtain F=82 nN.

The force is repulsive because the points charged have the same sign.

5 0

2 years ago

How does paving parking lots and roads with concrete or asphalt affect surface water and groundwater?

lidiya [134]

Parking lots with roads and concrete reduce infiltration. Infiltration is the process by which water penetrates the soil. Reducing the amount of water that enters the soil can eventually impact groundwater levels in some areas by decreasing it over time. Paved roads lead to increased surface runoff which increases the possibility of flooding in periods of heavy rainfall. This is known as urban flooding.

7 0

2 years ago

Hans Eysenck makes a connection between __________ and __________in explaining personality development. A. genetic factors . . .

tekilochka [14]

The answer is A, genetic factors...conditioning. I just took the test. Good luck!!

6 0

2 years ago

Read 2 more answers

A box is dropped from a spacecraft moving horizontally at 27.0 m/s at a distance of 155 m above the surface of a moon. The rate

gavmur [86]

Answer:

a) 10.54 sec

b) 284.58 m

c) 29.406 m/s

d) 39.92 m/s

Explanation:

Given data:

velocity of spacecraft = 27.0 m/s

rate of free fall acceleration is 2.79 m/s^2

distance of moving aircraft from mooon surface is 155 m

a. from kinematic eqaution of motion we have

$y = Vi\times t + (\frac{1}{2}) a\times t^2$

where y = 155 m

Vi = 0 as this relation is for vertical motion, so the 27.0 m/s is not included

and a = 2.79 m/s^2.

Solving for t we get

t = 10.54 sec

we know that $V = \frac{d}{t}$

$d = v\times t$

$= 27 \times 10.54 = 284.58 m$

c. from the kinematic formula

v = u + at

$v = 0 + 2.79\times 10.57$

v = 29.4066 m/a

d. $v = \sqrt { 27^2 + 29.406^2}$

v = 39.92 m/s

4 0

2 years ago

Read 2 more answers

If a particle experiences a non-zero net force the motion of the particle will be altered; that is..its velocity vector will cha

mafiozo [28]

Answer:

Newton's second law

Explanation:

Mathematically, Newton's second law can be written as

$F=ma$

where

F is the net force on the particle

m is its mass

a is the acceleration

This can also be rewritten as

$a=\frac{F}{m}$

which means that the acceleration is directly proportional to the force and inversely proportional to the mass. If the net force is non-zero, it means that the particle has a non-zero acceleration, therefore its velocity is changing (it can be changing either in magnitude, if the force has same direction as the velocity, or also in direction, if the force has a different direction).

3 0

2 years ago