The amount of heal required to heat 2.00 kg water from 40 degree C to 50 degree

Question

The amount of heal required to heat 2.00 kg water from 40 degree C to 50 degree C is: 83720 J, 41860 j, 62790 j, 8372 j The cover of your physics book measures 0.226 m long and 0.144 m wide. What is its area in square meters? 0.0325; 0.032544; 0.325; 0.03254 If a block is moving to the left at a constant velocity, what can one conclude? There must be no forces at all applied to the block. There is exactly one force applied to the block. The net force applied to the block is zero. The net force applied to the block is directed to the left. A boy is sitting still near the Centre of a rotating merry-go-round, while a girl is sitting closer to the Rim, which one of the following is true? The girl has smaller linear speed The boy has smaller linear speed Their linear speeds are the same None of the above A wood block is released and rises up from the bottom of a lake, during the process of its rising. Both the pressure and the buoyant force on the block remain the same The pressure on the block decreases, but the buoyant force on it remains the same The pressure on the block increases, but the buoyant force on it remains the same The pressure on the block remains the same, but the buoyant force on it increases A child throws a ball directly upward (as positive direction). What are the signs of the velocity and acceleration of the ball when the ball is moving upwards? both positive: both negative: only velocity is positive: only acceleration is positive.

Explanation / Answer

1.)Q = mc(t 2 - t 1 )

= 2 kg × 4200 J/(kg °C) × (50 - 40)°C

=84000J=84 kJ

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