Answer:
The book gravitational potential energy is 0.0784 Joules.
Explanation:
Given:
Mass of book, m = 20 g = 20 ÷ 1000 = 0.02 kg
Table height, h = 40 cm =40 ÷ 100 = 0.4 m
To Find:
Gravitational Potential Energy = ?
Solution:
Gravitational Potential Energy :
Gravitational potential energy is energy an object possesses because of its position in a gravitational field.
Formula is given by
Where,
m = mass
g = acceleration due to gravity = 9.8 m/s²
h = height
Substituting the values we get
The book gravitational potential energy is 0.0784 Joules.
Answer: Sprinter's average acceleration =
Explanation:
The formula for the average acceleration is given as follows:
--- (A)
Where,
= Final velocity =
= Initial velocity =
= Elapsed time = 10 seconds
Plug the values in equation (A):
Therefore, the sprinter's average acceleration is .
10°c
Explanation:
Given parameter;
Lower fixed point = 30mm
Upper fixed point = 180mm
Reading = 45mm
Unknown:
The degree celcuis temperature at 45mm = ?
Solution:
To solve this problem we simply compare the mm- scale to the celcius - scale that we know.
The upper fixed point is the boiling point of water
Lower fixed point is the freezing point of water
This shows that both the upper and lower fixed point of both thermometers are the same;
mm-scale °c scale
180mm 100°c
45mm x
30mm 0°c
Solving;
x (150) = 100 x 15
x = 10°c
learn more:
Temperature scales brainly.com/question/1603430
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Answer:
Explanation:
The magnitude of the electrostatic force between two charged objects is
where
k is the Coulomb's constant
q1 and q2 are the two charges
r is the separation between the two charges
The force is attractive if the charges have opposite sign and repulsive if the charges have same sign.
In this problem, we have:
is the distance between the charges
since the charges are identical
is the force between the charges
Re-arranging the equation and solving for q, we find the charge on each drop: