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3 years ago

The symbol most often used to describe density is?

Physics

1 answer:

daser333 [38]3 years ago

7 0

Answer:

he density, or more precisely, the volumetric mass density, of a substance is its mass per unit volume. The symbol most often used for density is ρ

Explanation:

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What would the reaction force of a person be that stands completely still with a mass of 100 kg?

Anastaziya [24]

-981N would be the reaction force of a person be that stands completely still with a mass of 100 kg.

An opposing force to an action force is referred to as a reaction force. The response force that results from surface engagement and adhesion while sliding is known as friction. Usually, the activities of applied forces result in reaction forces and reaction moments.

As,

F = ma

where, F = force

m = mass of object

a = acceleration due to gravity

Plugging in the values we get,

F = 100kg × 9.81m/s

F = 981 N

Since, reaction force acts opposite to action force so the correct answer is -981N.

Learn more about force here;

brainly.com/question/13191643

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4 0

2 years ago

Consider a ship of mass 2 x 10^6 kg with propeller blades of radius 7 m and it can push water backwards to a speed of 2 m/s. Giv

PolarNik [594]

Answer:

$a = 0.308 m/s^2$

Explanation:

As we know that the force due to propeller when it will push the water backwards is given as

$F = \frac{dP}{dt}$

now we know that

$P = mv$

so we have

$F = v\frac{dm}{dt}$

$F = v \rhoA\frac{dx}{dt}$

$F = \rho A v^2$

here we know that

$A = \pi r^2$

$A = \pi(7^2)$

$A = 154 m^2$

now the force is given as

$F = (1000)(154)(2^2)$

$F = 616000 N$

now the acceleration of the ship is given by Newton's II law

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

$a = \frac{616000}{2 \times 10^6}$

$a = 0.308 m/s^2$

3 0

3 years ago

Consider two identical electric bulbs of power P and resistance R. You connect them to a battery of voltage V. The first time yo

natulia [17]

Answer:

The answer is 2X as much illumination as connection in series

Explanation:

We are given from the question that the two bulbs are identical in power and resistance.

Firstly we know that In a series connection the Voltage across the circuit elements are different whereas In a parallel connection, the same value of voltage passes through all the circuit elements.

Power is expressed as ;

P = V^2/ R

An increase in voltage leads to an increase in power likewise if the voltage is reduced the power also reduces.

The two bulbs are said to be having the same resistances , so the voltage across them in a series connection will be halved

V =1/2V1 + 1/2 V2; making the illumination across them to be low.

Therefore in parallel the illumination will be twice as much the illumination when connected in series.

4 0

4 years ago

Read 2 more answers

A 75.0-kg ice skater moving at 10.0 m/s crashes into a stationary skater of equal mass. After the collision, the two skaters mov

Ksenya-84 [330]

Answer:

Explanation:

Momentum change for either skater is mΔv = 75.0(5.0) = 375 kg•m/s

As a change in momentum is equal to an impulse

375 = FΔt

F = 375/0.100 = 3750 N

As 3750 N < 4500 N no bones are broken.

4 0

3 years ago

Describe several threats to surface water and groundwater supplies

yulyashka [42]

1. pollution - Drinking tainted groundwater can have genuine wellbeing impacts. Ailments, for example, hepatitis and loose bowels might be caused by pollution from septic tank squander. Harming might be caused by poisons that have drained into well water supplies. Natural life can likewise be hurt by defiled groundwater.

2. depletion - Groundwater consumption is fundamentally caused by maintained groundwater pumping. A portion of the negative impacts of groundwater exhaustion: going away of wells. the diminishment of water in streams and lakes.

4 0

3 years ago