2 years ago

Define reversible change

Physics

1 answer:

inysia [295]2 years ago

8 0

A reversible change is a change that can be undone or reversed

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You would like to know whether silicon will float in mercury and you know that can determine this based on their densities. Unfo

dolphi86 [110]

Answer:

Explanation:

To convert gram / centimeter³ to kg / m³

gram / centimeter³

= 10⁻³ kg / centimeter³

= 10⁻³ / (10⁻²)³ kg / m³

= 10⁻³ / 10⁻⁶ kg / m³

= 10⁻³⁺⁶ kg / m³

= 10³ kg / m³

So we shall have to multiply be 10³ with amount in gm / cm³ to convert it into kg/m³

2.33 gram / cm³

= 2.33 x 10³ kg / m³ .

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3 years ago

You are walking at 3.75 km per hour across a frozen lake in the snow. You do not realize that with each step you turn 0.350 degr

VladimirAG [237]

Answer:

242.27929622673 meters

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3 years ago

You wish to buy a motor that will be used to lift a30-kg bundle of shingles from the ground to the roof of a house. The shingles

hodyreva [135]

Answer:

the minimum value of torque is 101.7 N-m.

Explanation:

Given that,

Mass of bundle of shingles, m = 30 kg

Upward acceleration of the shingles,

The radius of the motor of the pulley, r = 0.3 m

Let T is the tension acting on the shingles when it is lifted up. It can be calculated as :

T-mg=ma

T=m(g+a)

$T=10\times (9.8+1.5)\\T = 113 N$

Let $\tau$ is the minimum torque that the motor must be able to provide. It is given by :

$\tau=r\times T\tau=0.3\times 339\tau=101.7\ N-m$

the minimum value of torque is $101.7 N-m.$

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3 years ago

Sam is moving house and is carrying a 300N box of books up a flight of steps 5m high, it takes her 30 seconds. Gary follows her

hjlf

Answer:

Sam is providing the biggest power i.e. 50 W

Explanation:

Sam is moving house and is carrying a 300N box of books up a flight of steps 5m high, it takes her 30 seconds.

Sam's power :

$P_1=\dfrac{W_1}{t_1}\\\\P_1=\dfrac{F_1d}{t_1}\\\\P_1=\dfrac{300\times 5}{30}\\\\P_1=50\ W$

Gary follows her carrying a bag of clothes doing 1000 J of work; it only takes him 25 seconds.

Gary's power :

$P_2=\dfrac{W_2}{t_2}\\\\P_2=\dfrac{1000}{25}\\\\P_2=40\ W$

So, it is clear that Sam is providing the biggest power.

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3 years ago

What are autotrophs? Name three types of organisms that are autotrophs.

ValentinkaMS [17]

Autotrophs are organisms that can make its own food by synthesizing organic nutrients from inorganic materials. Three types include: photoautotrophs, chemoautotrophs, and plants.

4 0

2 years ago

Define reversible change​

Define reversible change