If it takes 10 seconds for a car to reach its top speed of 100 miles per hour, its acceleration would be. Help please
1 answer:
Answer:
or
Explanation:
Acceleration is rate of change of speed per unit time. The change in speed is given by deducting the initial speed from final speed. Assuming that the car starts from rest to a top speed of 100 miles per hour, then the change in speed is equivalent to 100-0=100 miles per hour.
Time is given in seconds and converting to hours will be 10/3600
The acceleration will then be
Alternatively, the change in speed xould be converted to miles per second hence 100/3600 miles per second divided by 10 s then rounded off as
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Answer:
0.686 g of ice melts each second.
Solution:
As per the question:
Cross-sectional Area of the Copper Rod, A =
Length of the rod, L = 19.6 cm = 0.196 m
Thermal conductivity of Copper, K =
Conduction of heat from the rod per second is given by:
where
= temperature difference between the two ends of the rod.
Thus
Now,
To calculate the mass, M of the ice melted per sec:
where
= Latent heat of fusion of water = 333 kJ/kg
Answer:
14.3kg
Explanation:
Given parameters:
Quantity of heat = 149000J
Change in temperature = 5.23°C
specific heat of the ice = 2000J/kg°C
Unknown:
Mass of the ice in the bag = ?
Solution:
The heat capacity of a substance is given as:
H = m c Ф
H is the heat capacity
m is the mass
c is the specific heat
Ф is the temperature change;
since m is the unknown, we make it the subject of the expression;
m = H/ mФ
m = = 14.3kg