Answer:
The correct answer would be - D. Cooking eggs
Explanation:
Among the given options there are 3 options that show exothermic reaction which means they give off the energy in the process. The running curs engine is the process that absorbs heat but releaseS it right away so it only transfers the energy. Activating a heating pad also transfers the energy from electric energy to thermal energy. Burning wood is a chemical reaction that releases energy in the form of light and heat.
The raw eggs absorb the heat from the pan and change its form but do not release it to the surrounding in any form while cooking. It is an endothermic reaction.
The atomic number of an atom is the number of protons in the nucleus of an atom.
Answer:
Frequency=10 Hz
Period=0.1 s
Explanation:
Frequency of a wave is the number of complete cycles per unit time. Usually, frequency is cycles per second, with unit as Heartz
Given cycles of the wave as 200 and time as 20 seconds
Frequency=200÷20=10 cycles per second
Therefore, frequency is 10 Hz
Period is usually the reviprocal of frequency hence reciprocal of 10 Hz will be 1/10=0.1 s
Answer:
Explanation:
A ) When gymnast is motionless , he is in equilibrium
T = mg
= 63 x 9.81
= 618.03 N
B )
When gymnast climbs up at a constant rate , he is still in equilibrium ie net force acting on it is zero as acceleration is zero.
T = mg
= 618.03 N
C ) If the gymnast climbs up the rope with an upward acceleration of magnitude 0.600 m/s2
Net force on it = T - mg , acting in upward direction
T - mg = m a
T = mg + m a
= m ( g + a )
= 63 ( 9.81 + .6)
= 655.83 N
D ) If the gymnast slides down the rope with a downward acceleration of magnitude 0.600 m/s2
Net force acting in downward direction
mg - T = ma
T = m ( g - a )
= 63 x ( 9.81 - .6 )
= 580.23 N