The fact that desert sand is very hot in the day and very cold at night is evidence that sand has
2 answers:
Answer:
A) a low specific heat.
Explanation:
As we know that heat given to the sand will increase it temperature
so we can say
here we will have
so now we will have
more change in temperature due to heat given to the sand will show that it must have low specific heat capacity as it inversely depends on the specific heat capacity of the sand
so correct answer will be
A) a low specific heat.
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Answer:
a = 2 [m/s^2]
Explanation:
To solve this problem we must use the expressions of kinematics, we must bear in mind that when a body is at rest its velocity is zero.
where:
Vf = final velocity = 0
Vi = initial velocity = 60 [m/s]
a = desacceleration [m/s^2]
t = time = 30 [s]
Note: the negative sign of the above equation means that the car is slowing down, i.e. its speed decreases.
0 = 60 - (a*30)
a = 2 [m/s^2]