Answer: A = 0.02 m²
Explanation: Solution:
Pressure is expressed in the formula:
P = F / A where F = mg
= mg /A
= 50 kg ( 9.8 m/s²) / 25000 Pa
= 0.02 m²
<span>The net force acting on the car from all directions is zero </span>
Answer:
(d) Water has a high specific heat.
Explanation:
At night, when the temperature of earth goes down due to loss of heat , the temperature of water is lost slowly and temperature of land is lost fast because of high specific heat of water . Water loses as well as gains temperature comparatively slowly due to its high specific heat .
During daytime when earth gains heat , the temperature of land rises more rapidly than water so water appears cool even during daytime when land becomes hotter . It is also due to high heat holding capacity of water or due to high specific heat of water .
Once then light is gone the air collapses back in and creates a sound wave that we hear<span> as </span>thunder<span>. The reason </span>we see lightning before we hear thunder<span> is because light travels faster than sound!
that is why
i hope my answer helped you</span>
Answer:
B. 8,437.5 J
Explanation:
<u>Given the following data;</u>
Height = 400m
Mass = 75kg
Velocity = 15m/s
Time = 10 secs
To find the kinetic energy of the skier?
Kinetic energy can be defined as an energy possessed by an object or body due to its motion.
Mathematically, kinetic energy is given by the formula;
<em>Where;</em>
- <em>K.E represents kinetic energy measured in Joules. </em>
- <em>M represents mass measured in kilograms. </em>
- <em>V represents velocity measured in metres per seconds square. </em>
<em>Substituting into the equation, we have;</em>
K.E = 8,437.5 Joules.