how long does it take a 750watt heater operating at full rating to rais the temperature of 1kg of water From 40°C to 70°C {S. H. C=4200j/kg/k and neglecte heat loss}

a piece of metal and a piece of brick are both sitting in the sun. If both are the same mass, what property of matter will make the metal feel hotter to the touch?

Which is better: a large or small sample size? why?

How does the rate of groundwater flow compare with that of ocean currents or river currents? Choose one: A. The rate of groundwater flow is faster than that of surface-water currents. B.

Q2. In a 4x100 m relay race, total track length is 200m and time taken by one particular group i s 50.2 s. What is the average speed and average velocity of that group?

How does surface currents would be affected if eArth didn't rotate

A woman holds a book by placing it between her hands such that she presses at right angles to the front and back covers. The book has a mass of m = 1.7 kg and the coefficient of static friction between her hand and the book is μs = 0.52.

Tony has a mass of 50 kg, and his friend Sam has a mass of 45 kg. Assume that both friends push off on their rollerblades with the same force. Explain which boy will have greater acceleration.

Which part of your ear do sound waves enter through?

Why do scientist use different types of models to represent compounds

Electronic signals that pulse current in a series of ones and zeros are known as