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4 years ago

When melted does the size of butter change

Physics

2 answers:

patriot [66]4 years ago

6 0

The size changes but the mass does not

bixtya [17]4 years ago

4 0

No. Because the solid and liquid is in the same volume

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a car with a mass of 1200 kilograms is moving around a circular curve at a uniform velocity of 20 m/s the centripetal force on t

jek_recluse [69]

Coupla things wrong with this question, Sam.
Let's clean those up first, and then we'll work on the answer.

-- The car is NOT moving with uniform velocity.
'Velocity' includes both speed and direction. If either of these
changes, it's a change of velocity.
On a circular track, the car's direction is CONSTANTLY changing,
so its velocity is too.
The thing that's uniform is its speed, not its velocity.

-- A 'neutron' is a subatomic particle found in the nucleus of most
atoms. It's not a unit of force. The unit of force is the 'Newton'.
_______________________

OK. A centripetal force of 6,000 newtons keeps 1,200 kg of mass
moving in a circle at 20 m/s.

The formula:

   Centripetal force = (mass) (speed)² / (radius)

Multiply each side
by 'radius': (centripetal force) x (radius) = (mass) x (speed)²

Divide each side by
'centripetal force':   Radius = (mass) x (speed)² / (centripetal force)

Write in the numbers
that we know: Radius = (1200 kg) (20 m/s)² / (6000 Newtons)

   = (1200 kg) (400 m²/s²) / (6000 Newtons)

   = (480,000 kg-m²/s²) / (6000 kg-m/s²)

   = (480,000 / 6000) meters

   = 80 meters .

8 0

3 years ago

Read 2 more answers

A circular loop of flexible iron wire has an initial circumference of 164cm , but its circumference is decreasing at a constant

Travka [436]

Answer:

emf = 0.02525 V

induced current with a counterclockwise direction

Explanation:

The emf is given by the following formula:

$emf=-\frac{\Delta \Phi_B}{\Delta t}=-B\frac{\Delta A}{\Delta t}$ $\ \ =-B\frac{A_2-A_1}{t_2-t_1}$ (1)

ФB: magnetic flux = BA

B: magnitude of the magnetic field = 1.00T

A2: final area of the loop; A1: initial area

t2: final time, t1: initial time

You first calculate the final A2, by taking into account that the circumference of loop decreases at 11.0cm/s.

In t = 4 s the final circumference will be:

$c_2=c_1-(11.0cm/s)t=164cm-(11.0cm/s)(4s)=120cm$

To find the areas A1 and A2 you calculate the radius:

$r_1=\frac{164cm}{2\pi}=26.101cm\\\\r_2=\frac{120cm}{2\pi}=19.098cm$

r1 = 0.261 m

r2 = 0.190 m

Then, the areas A1 and A2 are:

$A_1=\pi r_1^2=\pi (0.261m)^2=0.214m^2\\\\A_2=\pi r_2^2=\pi (0.190m)^2=0.113m^2$

Finally, the emf induced, by using the equation (1), is:

$emf=-(1.00T)\frac{(0.113m^2)-(0.214m^2)}{4s-0s}=0.0252V=25.25mV$

The induced current has counterclockwise direction, because the induced magneitc field generated by the induced current must be opposite to the constant magnetic field B.

4 0

3 years ago

What is milo Murphy’s law

yKpoI14uk [10]

Answer:

It revolves around the title character, Milo Murphy, who is a descendant of Edward A. Murphy Jr., the namesake of Murphy's Law, which states that anything that can go wrong will go wrong.

6 0

4 years ago

The acceleration of the body in the graph given below is____

Art [367]

Acceleration = -12 / 8 = - .... m/s^2

5 0

3 years ago

A fathom is a unit of length about 6 ft long commonly used in measuring depths of water. Because a fathom is about the length of

Naddik [55]

Distance to the moon = 4× $10^{8}$ m.