Two children A and B each weigh 20 kg climb a rope up a height of 10 m. The child A takes 10 s, and child B take 20s, to climb. Out of these two children, who has more power? Compare their powers.

Two children A and B each weigh 20 kg climb a rope up a height of 10 m. The child A takes 10 s, and child B take 20s, to climb. State whether the work performed by both the children is equal or different.

Two girls, each of weight 400 N climb up a rope through a height of 8 m. We name one of the girls A and the other B. Girl A takes 20 s while B takes 50 s to accomplish this task. What is the power expended by each girl?

A man whose mass is 50 kg climbs up 30 steps of a stair in 30 s. If each step is 20 cm high, calculate the power used in climbing stairs.

A factory manufactures two types of screws, A and B. Each type of screw requires the use of two machines, an automatic and a hand operated. It takes 4 minutes on the automatic and 6 minutes on hand operated machines to manufacture a package of screws A, while it takes 6 minutes on automatic and 3 minutes on the hand operated machines to manufacture a package of screws B. Each machine is available for at the most 4 hours on any day. The manufacturer can sell a package of screws A at a profit of Rs 7 and screws B at a profit of Rs 10. Assuming that he can sell all the screws he manufactures, how many packages of each type should the factory owner produce in a day in order to maximise his profit? Determine the maximum profit

Calculate the power of a crane in watts,which lifts a mass of 100 kg to a height of 10 m in 20 s.

A tank of capacity 10^3 kg is placed at the top of a house 10 m high.This tank is filled by a motor in 30 minutes by lifting water from a 20 m deep well.Find the power of motor(Take g=10m s^(-2) .

A person carrying 10 bricks each of mass 2.5 kg. on his head moves to a height 20 metres in 50 seconds. Calculate the power spent in carrying bricks of the person.

A doctor is called to see a sick child. The doctor knows (prior to the visit) that 90% of the sick children in that neighbourhood are sick with the flu, denoted by F , while 10% are sick with the measles, denoted by Mdot A well-known symptom of measles is a rash, denoted by R. The probability having a rash for a child sick with the measles is 0.95. however, occasionally children with the flu also develop a rash, with conditional probability 0.08. upon examination the child, the doctor finds a rash. The what is the probability that the child has the measles? a. 91//165 b. 90//163 c. 82//161 d. 95//167