science 12th grade

Mass of the body (m) = 5 kg Velocity of the body (v) = 15 m/s Kinetic energy Kinetic energy = 562.5 J 02. A dog of mass 20 kg is running at a constant speed of 12 m/s. Calculate the kinetic energy of the dog while it is runni..

01. A man of mass 60 kg runs up a flight of 60 steps in 40 seconds. If each step is 20 cm high, calculate his power. Solution : Since the man runs up a flight of steps, the work done will be equal to the potential energy. Height = height of one step x number of ste..

Question: How do the prefixes and suffixes for the open chain hydrocarbons indicate their formula? Answer: The prefixes meth-, eth-, prop-, but-, pent-, hex-, hept-, oct-, non- deca- indicate that the number of 'C' atoms in the molecule of hydrocarbons is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 re..

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Gravitational Force between two Light Objects - Let us now calculate the force of gravitation existing between two unit masses separated by a unit distance. m 1 = 1 kg m 2 = 1 kg d = 1m G = 6.6734 x 10 - 1 1 Nm 2 /kg 2 This is a very weak force. To find Force existing between two objects of masses ..

The expression for acceleration due to gravity ..

Resistance of a conductor is inversely proportional to the area of the cross-section of the uniform wire. That means thinner the wire greater the resistance and thicker the wire lower the resistance. If A is the area of cross-section of the uniform wire, then By combining both the factors, w..

Question: According to the laws of reflection, 1. i = r 2. i > r 3. r >..

Rating of Electrical Appliances - Generally electrical appliances such as an electric bulb, geyser, heater, etc. are rated with power and voltage. A bulb rated as 100W - 250V, means that when a bulb is lit on a 250V supply, it consumes 100 W of electric power. This means that, 100 J of electrical e..