Answer:
Heat needed = 71.19 J
Explanation:
Here heat required can be calculated by the formula
H = mL
M is the mass of water and L is the latent heat of vaporization.
Mass of water, m = 31.5 g = 0.0315 kg
Latent heat of vaporization of water = 2260 kJ/kg
Substituting
H = mL = 0.0315 x 2260 = 71.19 kJ
Heat needed = 71.19 J
Drawing is an easy way to connect to your inner child
Answer:

Explanation:
The electric force between two charged objects is given by:

where:
k is the Coulomb's constant
q1 and q2 are the charges of the two objects
r is their separation
In this problem:
q1 = 2.0 C
q2 = 1.0 C
r = 2 m
So, the electric force is

Answer:
E) a billion times brighter
Explanation:
- <u>The sun is a star, which is about billion times brighter as the reflected light from any planet orbiting around it. </u>
- The brightness is based on its composition and its position from the planet. The sun happens to be the brightest star on the Earth's sky which is about 13 billion times brighter than the next brightest star.
Answer:
Coefficient of friction is
.
Work done is
.
Explanation:
Given:
Mass of the box (
):
kg
Force needed (
):
N
The formula to calculate the coefficient of friction between the floor and the box is given by

Here,
is the coefficient of friction and
is the acceleration due to gravity.
Substitute
N for
,
kg for
and
m/s² for
into equation (1) and solve to calculate the value of the coefficient of friction.

The formula to calculate the work done in overcoming the friction is given by

Here,
is the work done and
is the distance travelled.
Substitute
N for
and
for
into equation (2) to calculate the work done.
