Other Questions

Other Questions

1. What is the ratio of change of the length of the shadow and what is the velocity of the shadow?

h hp



ls

Solution:

Since denominator of velocity of the shadow is positive and less than one, the velocity of the shadow is slightly faster, than 3m/s. The length of the shadow is dependent on time and the ratio of the person (hp) and the difference between the height of the person and the light source.

1. You have a car and a balloon is tied to the passenger seat. If you go from rest what happens to the balloon?

Solution:

The balloon would appear to move backwards in reference to the car and stay in the same place in reference to an outside observer due to inertia and the balloon not being rigidly connected to the car.

1. What is a neutron, alpha particle, and beta particle. Draw a He42 nucleus.

Solution:

The neutron is a subatomic particle with no net electric charge and a mass slightly larger than that of a proton

Alpha particles (named after and denoted by the first letter in the Greek alphabet, α) consist of two protons and two neutrons bound together into a particle identical to a helium nucleus; hence, it can be written as He2+ or 42He2+.

Beta particles are high-energy, high-speed electrons or positrons emitted by certain types of radioactivenuclei such as potassium-40. The beta particles emitted are a form of ionizing radiation also known as beta rays

1. What are the four forces on an airplane? How is lift generated?

Solution:

Lift, drag, thrust and weight. Lift is generated by every part of the airplane, but most of the lift on a normal airliner is generated by the wings. Lift is a mechanical aerodynamic force produced by the motion of the airplane through the air.

1. Pick a course you liked and show me something?

Solution:

This is the best or worst question: Pick something you know and talk until they ask you to stop. Draw everything out and explain in as much detail as possible.

1. Find at what height the water will go if steady or if it will all draw out?

Solution:

Describe Volume with respect to time:

As , height will decrease to zero.

1. The winch on the 10-ton barge slowly pulls in the line. How far has each barge moved when they are 25 feet apart?

Solution:

Conserve center of mass:

Center of mass is:

10T barge pulls in on rope and length goes to 25’

Solve for x: x=10, so 10T barge moves ten feet to right, and 15T barge moves 10 feet to the left.