Physics Answers

If it is sufficient to express the specific heat as a function of temperature with Cp=a+bT, choose one of the chemicals in the list below and calculate the increase in the internal energy of the unit mass from 300K at 150kPa to 500K at constant pressure by deriving the relevant relation. How many errors (%) would have been made if the fixed Cv value were taken?

Find the temperature, mass and total enthalpy of the liquid and vapor phases of 5 kg of water in a container with a pressure of 150 kPa and a constant volume of 200L.

Find the electric flux ΦE through a spherical surface of radius R that

contains an electric dipole as shown in the diagram.

Action potential of muscle is initiated by the

impulses arriving from [Best answer ].

A. motor neurons

B. Sensory neurons

C. Interneurons

Bone electricity is due to [Best answer ]

A. the piezoelectric effect of crystalline

material in the bone.

B. the ion motion across bone membrane.

C. neuronal activities passed onto the bone.

D. the muscles attached to the bone.

using the current cost of electricity in saskatchewan (13.267 cents per kWh), how much did it cost to run a waffle maker

The driver of a 2.0 × 103 kg red car traveling on the highway at 45m/s slams on his brakes to avoid striking a second yellow car in front of him, which had come to rest because of blocking ahead as shown in above Fig. After the brakes are applied, a constant friction force of 7.5 × 103 N acts on the car. Ignore air resistance.

(a) Determine the least distance should the brakes be applied to avoid a collision with the other vehicle? 

(b) If the distance between the vehicles is initially only 40.0 m, at what speed would the collision occur?

(c) Write your conclusive observations on the result obtained from this numerical. i.e. the importance of Physics in daily life.

2. Find the total flux ΦE passing through the sides of a cube 1.00 m on a side if a point charge of 5.00 × 10−6 C is located at its center.

2. Find the total flux ΦE passing through the sides of a cube 1.00 m on a side if a point charge of 5.00 × 10−6 C is located at its center.

What is an example of the first law of thermodynamics? 5.0-g bullet traveling at a

speed of 300 m/s enters a tree and exits the other side with a speed of 150 m/s.

Where did the bullet’s lost kinetic energy go, and how much energy was

transferred?

(b) What is the application of thermodynamics in engineering studies