Answer:
m = 35 g
Explanation:
The specific heat of a material can be calculated by the following formula:
where,
C = Specific Heat of Wax = 220 J/g
Q = Amount of Heat Supplied by the Heater = 7700 J
m = mass of wax melted = ?
Therefore,
<u>m = 35 g </u>
(263.1 years) x (half-life / 87.7 years) = 3 half-lifes
In 3 half-lifes, (1/2 x 1/2 x 1/2) = 1/8 of the atoms in a sample remain unchanged.
That's 12.5% that remain unchanged.
The other 87.5% of the atoms in the sample have decayed, and changed to either other isotopes of plutonium or into atoms of other elements.
Answer:
Power = 14.7 W
Explanation:
Given:
Mass of the object to be raised is,
Height to be raised is,
Time taken during the work is,
As the object is raised vertically, the acceleration acting on it is due to gravity and is equal to 9.8 m/s².
Now, work done in moving an object of mass 'm' to a height 'h' is given as:
Now, power is given as the rate of doing work which is given as:
Now, plug in all the values and solve for power. This gives,
Therefore, the power required to raise the object to a height of 3 meters is 14.7 watts.
Answer:
【 In vector form , if angle between velocity vector and acceleration vector is less than 90° and greater than 0° then it is positive acceleration and if it is less than 180° and greater than 90° then it is negative acceleration. If there is no acceleration vector then it is called zero acceleration. 】
Answer:
Yes you are using energy to carry that thing.(Force is applied)
Explanation: