Questions from College Physics

Q: In the human nervous system, signals are transmitted along neurons as

In the human nervous system, signals are transmitted along neurons as action potentials that travel at speeds of up to 100 m/s. (An action potential is a traveling influx of sodium ions through the me...

Q: A blacksmith heats a 0.38 kg piece of iron to

A blacksmith heats a 0.38 kg piece of iron to 498°C in his forge. After shaping it into a decorative design, he places it into a bucket of water to cool. If the available water is at 20.0°C, what mini...

Q: Before the discovery of the neutron, one theory of the nucleus

Before the discovery of the neutron, one theory of the nucleus proposed that the nucleus contains protons and electrons. For example, the helium-4 nucleus would contain 4 protons and 2 electrons inste...

Q: (a) How much ice at −10.0°

(a) How much ice at −10.0°C must be placed in 0.250 kg of water at 25.0°C to cool the water to 0°C and melt all of the ice? (b) If half that amount of ice is placed in the water, what is the final te...

Q: The student from Problem 79 realizes that standing naked in a cold

The student from Problem 79 realizes that standing naked in a cold room will not give him the desired weight loss results since it is much less efficient than simply exercising. So he decides to “burn...

Q: A 75 g cube of ice at −10.0°

A 75 g cube of ice at −10.0°C is placed in 0.500 kg of water at 50.0°C in an insulating container so that no heat is lost to the environment. Will the ice melt completely? What will be the final tempe...

Q: A 2.0 kg block of copper at 100.0

A 2.0 kg block of copper at 100.0°C is placed into 1.0 kg of water in a 2.0 kg iron pot. The water and the iron pot are at 25.0°C just before the copper block is placed into the pot. What is the final...

Q: A 0.360 kg piece of solid lead at 20°

A 0.360 kg piece of solid lead at 20°C is placed into an insulated container holding 0.980 kg of liquid lead at 420°C. The system comes to an equilibrium temperature with no loss of heat to the enviro...

Q: A piece of gold of mass 0.250 kg and at

A piece of gold of mass 0.250 kg and at a temperature of 75.0°C is placed into a 1.500 kg copper pot containing 0.500 L of water. The pot and water are at 22.0°C before the gold is added. What is the...

Q: The maximum pressure most organisms can survive is about 1000 times atmospheric

The maximum pressure most organisms can survive is about 1000 times atmospheric pressure. Only small, simple organisms such as tadpoles and bacteria can survive such high pressures. What then is the m...