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4 years ago

Help meee

Physics

1 answer:

Novay_Z [31]4 years ago

7 0

Answer:

A.the speed of the object moving at close to the speed of light

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What minimum heat is needed to bring 250 g of water at 20 ∘C to the boiling point and completely boil it away? The specific heat

Amiraneli [1.4K]

Answer:633.8 KJ

Explanation:

Given

mass of water $\left ( m\right )=250gm$

Initial temperature $\left ( T_i\right )=20^{\circ}C$

Final temperature $\left ( T_f\right )=100^{\circ}C$

Specific heat of water $\left ( c \right )$ =4190 J/kg-k

heat of vaporization $\left ( L\right )=22.6\times 10^5 J/kg$

Heat required for process $\left ( Q\right )$ =heat to raise water temperature from 20 to 100 +Heat to vapourize water completely

Q=mc $\left ( T_f-T_i\right )+mL$

Q= $0.25\times 4190\times \left ( 100-20\right )+0.25\times 22\times 10^5$

Q= $\left ( 0.838+5.5\right )\times 10^5$

Q= $6.338\times 10^5J=633.8 KJ$

4 0

4 years ago

A 20.0 kg suitcase is raised 3.0 m above a platform. How much work is done on the suitcase?

Lisa [10]

Answer:

600

Explanation:

m=20

g=10m\s2

h=3m

we have

w=m*g*h

=20*10*3

=600joule

3 0

4 years ago

You want to set up an aquarium and need to determine what size tank to buy. The graph shows tank sizes using a rule that relates

sineoko [7]

connexus unit 8 lesson 1 PRACTICE!

1) B

2) C

3) A

4) C

5) B

6) A

7) D

8) A

9) D

10) A

11) A

12) C

13) D

14) C

15) B

16) B

Hope this helps you guys out!

4 0

3 years ago

Read 2 more answers

Place several E-Field Sensors at a few points on different equipotential lines, and look at the relationship between the electri

Vlada [557]

Answer:

Explanation:

If a charge is moved along a equipotential line, no work is done on the charge.
If we remember that the work done by an external force, is just the product of the component of the force parallel to the displacement, if the force produces no work, this means that is perpendicular to the displacement.
So, as the electric field is just the force per unit charge, and has the same direction as the force (for a positive charge), it must be perpendicular to any equipotential line.
As the electric field (by convention) has the same direction as it would be taken by a positive test charge, and positive charges move from higher voltages to lower ones, the electric field is directed toward lines of lower voltages (like it happens between the plates of a capacitor).

3 0

3 years ago

Which describes the type of image formed by a plane mirror?

guajiro [1.7K]

Answer:

It is a copy of an object and appears to be coming from behind the mirror.

Explanation:

The plane mirror has a flat surface, where of its surface is polished to reflect the light.
The plane mirror shows the image as the same size of the object.
The image produced by the plane mirror is virtual and erect.
But the orientation of the image formed changes the left and right.
Hence,the image appears to be coming from behind the mirror.

6 0

3 years ago

Read 2 more answers