the main purpose of the turbine in the turbojet engine is to? A. reduce the temperature of the exaust gas. B. increase the velocity of the exaust gasses. C. compress the air. D. drive the compressor.
A machine has a mechanical advantage of 5. if 300 newtons of input force is used to produce 3,000 newton meters of work what is the output force and what is the distance over which the work is applied
In a motor, the combined effect of electric currents and magnetic forces turn electrical energy into which of the following? A. a battery B. a generator C. mechanical energy D. electromagnetic energy Will it be C or D I am stuck between those two
The weight of an object is the product of its mass, m, and the acceleration of gravity, g (where g=9.8 m/s2). If an object’s mass is m=10. kg, what is its weight?
Which of the following is NOT an example of kinetic energy being converted to potential energy A) A basketball player jumping for a rebound B) Releasing a compressed spring C) Sqeezing a rubber ball D) Pulling a sled uphill
What is nuclear fission? (Points : 1) the splitting of the atomic nucleus into parts the process of two or more atomic particles sticking together to form a heavier atomic nucleus the creation of high-energy plasma
A planet’s gravity is related to which of the following? (Points : 5) orbit weight and density surface area mass and size A? What is the removal of trees without adequate replanting? (Points : 5) bioremediation a carrying capacity deforestation a monoculture C? According to Hubble’s Law, the farther away a galaxy is, (Points : 5) the faster it is moving toward us the slower it is moving toward us the slower it is moving away from us the faster it is moving away from us C?? Electromagnetic energy can be defined as which of the following? (Points : 5) the waves of the electromagnetic spectrum energy that moves as particles at the speed of light the frequency of the emission spectrum energy that moves as a wave at the speed of light B?
A star’s light is alternately shifted from the blue part of the light spectrum to the red part. What does this mean about the length of light waves and movement of the star? A. The wavelengths are getting shorter then longer, meaning the star is moving away from the observer. B. The wavelengths are getting shorter then longer, meaning the star is moving toward the observer. C. The wavelengths are getting shorter then longer, meaning the star is revolving around another unseen object. D. The wavelengths are getting shorter then longer, meaning the star is rotating rapidly.
