Answer:
Mass of ball = 3.0102 Kg.
Explanation:
Potential energy at height h is given by
PE = mgh
where m is the mass of the body
g is the the acceleration due to gravity whose value is 9.8 m/s^2
h is the height from surface level
PE is potential energy
In the problem given h = 2 meters
PE = 59 joules
59 = m*9.8*2
=> m = 59/9.8*2 = 3.0102 Kg
Thus, mass of ball is 3.0102 Kg.
The amount of NOx emission produced by a household is required.
The total amount of NOx the household is responsible for is 91.06 kg.
1 car produces 11 kg of NOx per year.
Natural gas burning produces 4.3 g of NOx per therm.
Electric power plant produces 7.1 g of NOx per kwh.
2 cars will produce of NOx.
1200 therms of natural gas will produce
9000 kWh will produce
Converting all to kg and finding the total amount
The total amount of NOx the household is responsible for is 91.06 kg.
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Answer:Stop watches are also used to measure time in some sports.
Explanation:clocks
In the past, a common time measuring instrument was the sundial. Today, the usual measuring instruments for time are clocks and watches. For highly accurate measurement of time an atomic clock is used. Stop watches are also used to measure time in some sports.
Answer:
2.4 secs.
Explanation:
Current (A) = Charge (coulomb)/Time(sec)
We are looking for time. So:
Time (sec) = Charge (coulomb)/Current (A)
↓
12coulombs/5.0A = 2.4 secs
Answer:
C. 500 J
Explanation:The equation of Kinetic energy is KE = (mv^2)/2 therefore here m, which is mass, is 10 and v, which is velocity, is 10 as well. So KE = (10x10^2)/2 = 1000/2 = 500. And there we get the answer as 500 hence the answer is C. 500J
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