Reference no: EM13973075
1.) A spiral spring is compressed so as to add units of potential energy to it. When this spring is instead stretched one-half of the distance it was compressed, its remaining potential energy in the same units will be :
A) U/2
B) U/3
C) U/4
D) 2U/3
E) 3U/4
2) You slam on the brakes of your car in a panic and skid a distance on a straight and level road. If you had been traveling at half the speed, what distance would the car have skidded under the same conditions?
A) the same
B) A-1d
C) A-1d
D) 2d
E) 4d
3) Consider two frictionless inclined planes with the same vertical height. Plane 1 makes an angle of 35A-1 with the horizontal, and plane 2 makes an angle of 55A-1 with the horizontal. Mass m1 is placed at the top of plane 1, and mass m2 is placed at the top of plane 2. Both masses are released at the same time. At the bottom, which mass is going faster?
A) m1 is faster at the bottom because of the angle is smaller.
B) m2 is faster at the bottom because of the angle is larger.
C) Neither, they both have the same speed at the bottom.
D) The one with the greater mass is faster at the bottom.
E) The one with the lighter mass is faster at the bottom.
4) Which of the following statement about work is true?
A) Negative net work done on an object always reduces the objectA????1s total energy.
B) If the work done on an object by a force is zero, then either the force or the displacement must have zero magnitude.
C) If a force acts downward, it does negative work.
D) The formula W = Fd cos? can be used if the force is variable over the distance d.
E) None of the above
5) A 10 kg stone and a 100 kg stone are released from rest at the same height above the ground. There is no appreciable air drag. Which of the following statements is not true?
A) Both stones have the same initial gravitational potential energy.
B) Both stones will have the same acceleration as they fall.
C) Both stones will have the same speed when they reach the ground.
D) Both stones will have the same potential energy when they reach the ground.
E) Both stones will reach the ground at the same time.
|
Compare and contrast sheep and goats
: Sheep and goats have several similarities, but are also different in many ways. Keeping this in mind, compare and contrast sheep and goats.
|
|
Determine the energy of the emitted photon
: An electron jumps from the third level to the first level in hydrogen atom. What is the energy of the emitted photon?
|
|
Explain synthesise legal and ethical issues
: It should be free from spelling and grammatical errors. You must also include Reference List (APA style) of all of the reference sources that you used. Your assignment MUST be...
|
|
Give examples of bacteria that we humans need to survive
: Give 3 examples of bacteria that we humans need to survive and how they help us. Also, note what type of symbiotic relationship is illustrated with each example.
|
|
What distance would car have skidded under same conditions
: You slam on the brakes of your car in a panic and skid a distance on a straight and level road. If you had been traveling at half the speed, what distance would the car have skidded under the same conditions?
|
|
What are the ssids of the two access points
: What are the SSIDs of the two access points that are issuing most of the beacon frames in this trace - What are the intervals of time between the transmissions of the beacon frames.
|
|
Developing an elevator speech
: Then, rank the following factors in order of importance when developing an elevator speech, and provide a rationale for your response
|
|
Search the text data file for the final project
: See sample data file below. You are encouraged to add entries and share them with the rest of the class. Implement a program to read and search the text data file. The project will be graded according the criteria for the final project - see below..
|
|
Find the magnitude of the magnetic field
: Find the magnitude of the magnetic field that results in a force per unit length on the wire of 0.12N/m in the -z -direction. Express your answer to two significant figures and include the appropriate units.
|