An astronaut floating freely in space decides to use his flash light as a rocket. He shines a $$10\ watt$$ light beam in a fixed direction so that he acquires momentum in the opposite direction. If his mass is $$80\ kg,$$ how long must he need to reach a velocity of $$1\ ms$$

A ball of mass 0.9 kg is projected with an initial velocity of 10 m/s at an angle of 37 ∘ with the horizontal. After 0.6 sec, the gravitational field vanishes and a force of constant magnitude is applied on the ball afterwards, the force being always perpendicular to the direction of motion till it strikes the ground. When it strikes the ...

The average weight of 3 men A, B and C is 84 kg. Another man D joins the group and the average now becomes 80 kg. If another man E, whose weight is 3 kg more than that of D, replaces A, then the average weight of B, C, D and E becomes 79 kg. The weight of A is:

Ricardo, of mass $$ 80\, kg, $$ and Carmelita, who is lighter, are enjoying Lake Merced at dusk in a $$ 30 \,kg $$ canoe. When the canoe is at rest in the placid water, they exchange seats, which are $$ 3.0 \,m $$ apart and symmetrically located with respect to the canoes center.

A dietician wishes to mix two types of foods in such away that the vitamin contents of the mixture contains at least 8 units of vitamin A and 10 units of vitamin C. Food I contains 2 units/kg of vitamin A and 1 unit/kg of vitamin C while Food II contains 1 unit/kg of vitamin A and 2 units/kg of vitamin 1 unit/kg of vitamin C.

57. A man weighs 80 kg. He stands on a weighing scale in a lift which is moving upwards with a uniform acceleration of 5m/s. What would be the reading on the scale? (g = 10 m/54 (1) Zero (2) 400 N (3) 800 N (4)1200 N

The average weight of 3 men A, B and C is 84 kg. Another man D joins the group and the average now becomes 80 kg. If another man E, whose weight is 3 kg more than that of D, replaces A, then the average weight of B, C, D and E becomes 79 kg. The weight of A is:

A man weighing 80 kg is standing on a trolley weighing 320 kg. The trolley is resting on frictionless horizontal rails. If the man starts walking on the trolley along the rails at a speed 1 ms − 1 then after 4 second his displacement relative to the ground will be :

A dietician wishes to mix two types of foods in such away that the vitamin contents of the mixture contains at least 8 units of vitamin A and 10 units of vitamin C. Food I contains 2 units/kg of vitamin A and 1 unit/kg of vitamin C while Food II contains 1 unit/kg of vitamin A and 2 units/kg of vitamin 1 unit/kg of vitamin C.

Click here👆to get an answer to your question ️ A grocer purchased 80 kg of sugar at Rs. 13.50 per kg and mixed it with 120 kg sugar at Rs. 16 per kg. At what rate should he sell the mixture (per kg) to gain 16% ?