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3 years ago

Which substance has a melting point greater than room temperature?

Physics

1 answer:

blagie [28]3 years ago

4 0

Answer:

I think the answer is D.)

Explanation:

If it means something needs to melt into liquid i would have gone with B.) or C.) but since it doesn't specifiy. I thought D.) since all you have to do is heat it and it melts or boils.

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Another term for electromotive force is _____. voltage current resistance power

Ray Of Light [21]

Voltage because I said so

3 0

3 years ago

Determine if the object would move or not

lorasvet [3.4K]

I don't see a picture

4 0

3 years ago

The coil springs on a car's suspension have a value of k = 64000 N/m. When the

AlladinOne [14]

80 joule is momentarily stored in each spring

Solution:

Given that,

The coil springs on a car's suspension have a value of k = 64000 N/m

When the car strikes a bump the springs briefly compress by 5.0 cm (.05 m)

By compressing the spring, we apply a force over a distance

As a result we have done work on the spring

Doing work means that we have transferred energy to spring in form of elastic potential

Therefore,

k = 64000 N/m

x = 0.05m

The elastic potential energy is given as:

$PE = \frac{1}{2}kx^2$

Where, "k" is the spring constant and "x" is the displacement

$PE = \frac{1}{2} \times 64000 \times 0.05^2\\\\PE = 32000 \times 0.0025\\\\PE = 80$

Thus 80 joule is momentarily stored in each spring

8 0

4 years ago

A ball is thrown straight upward and returns to the thrower's hand after 3 seconds in the air. A second ball is thrown at an ang

Katena32 [7]

Explanation:

Given that the first ball is thrown vertically and upward.

since it reaches the throwers hand after 3 seconds, then the time taken to reach maximum height is

= T/2

=3/2

=1.5 seconds

Also, the projection angle for the second ball is 30°

we know that at maximum height vertical velocity is 0

therefore the final velocity of the first ball is

Vy= 0

Also, since the first ball is thrown upward the horizontal velocity is 0

Vx=0

from the first law of motion

Vy=u+at

Vy=0, a= -g

Uy=gt

Uy=9.81*1.5

Uy=14.7m/s

since both reach the same height, they will have the same vertical velocity

Uy= Vo sin∅

Vo=Uy/sin∅

Vo= 14.7/sin 30

Vo=29.4m/s

4 0

4 years ago

A parking lot charges 3 dollars for the first hour (or part of an hour) and 2 dollars for each succeeding hour (or part), up to

Aneli [31]

Answer:

function is discontinuous

and

after 3 hours upto day 24 hours fix charge $10

so there are discontinuous at 1st hour, 2nd hours and 3rd hours

Explanation:

given data

charge = $3 for 1st hour

charge = $2 for each succeeding hour

maximum charge = $10 daily

to find out

Is this function continuous

solution

their function is 3 +2x

so function is discontinuous here

and

this is very clear for 1st hour or part of hour it mean charge a fix value in given time

anyone who park fix charge for 60 min up to the 3 hours

after that for day 24 hours fix charge $10

so there are discontinuous at 1st hour, 2nd hours and 3rd hours

6 0

4 years ago