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2 years ago

When a car travels around a curve in the road , what supplies the centripetal force needed ?

1 answer:

6 0

The centrifugal force working against the car would be the entire car's weight, so the centripetal force that is supplied to the car must be the car's tires traction, aka the friction of the car's tires and the surface.

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Convert 2536 mm/min to m/s. Use dimensional analysis.

Deffense [45]

Answer:

As we know that, 

1 mm/min = 1.66667E-5 m/s
1 m/s = 60000 mm/min

Now, come to the question - 

$\\ \implies \sf \: 2536 \times 1.66667E-5 m/s \\ \\ \\ \implies \sf \blue{0.0422666667 \:m/s } \\$

Result : 2536 mm/min = 0.0422666667 m/s.

6 0

3 years ago

How much heat energy (in megajoules) is needed to convert 7 kilograms of ice at –9°C to water at 0°C?

dedylja [7]

Answer;

A. 2.48 MJ

Explanation;

-Heat energy may be given by the product of specific heat capacity , mass and change in temperature, or the product of heat capacity and change in temperature.

-When a substance is changing from solid state to liquid state then the heat energy is calculate by multiplying the latent heat of fusion of a substance by the mass. Latent heat of fusion of ice =3.34×10⁵J/kg and specific heat capacity of water is 2100 J/kg/K.

Specific heat energy: Q = mcΔT

Latent heat energy: Q = mLf

In this case the heat energy required will be;

Heat required to melt ice and raise its temperature to 0°C:

Q₁ = mLf+mciΔT

Q₁ = (7 kg*3.34×10⁵J/kg) + ((7kg*2100J/kgK*{0°C-(9°C)})

= 2.48 MJ (MEGA JOULES)

3 0

3 years ago

Read 2 more answers

It is 32 degrees F outside. What is this in Kelvin?

igomit [66]

Answer:

273.15

Explanation:(32°F − 32) × 5/9 + 273.15 = 273.15K

3 0

3 years ago

What fills the void between stars and galaxies.

Lana71 [14]

Answer: The voids between stars in our galaxy can be filled with tenuous clouds of gas and other molecules. ... That material gets "ripped away" from the galaxies by the force of gravity, and often enough it collides with other material.

HOPE IT HELPED:) HAVE A NICE DAY

6 0

3 years ago

An old clock has a spring that must be wound to make the clock hands move. Which statement describes the energy of the spring an

topjm [15]

Answer:

Explanation:

neither the spring or hands are in the action of movemnet

8 0

3 years ago