If you put 75 newtons of force into a machine and lift an object with a weight of 150 newtons, what can you say about the percent efficiency of the machine? A. The machine is 50% efficient...

If you put 75 newtons of force into a machine and lift an object with a weight of 150 newtons, what can you say about the percent efficiency of the machine? A. The machine is 50% efficient...

Someone exerts a force of 67 N over a distance of 38 cm on a wedge. If the efficiency of the wedge is 50%, what is the output work? A. 12.7 J B. 50.9 J C. 335 J D. 1,273 J

A pulley system has a percent efficiency of 74%. How does this value change over time as this machine does work on a bucket of sand? A. It decreases. B. It increases. C. It doesn't...

1. The weight of the liquid displaced is less than the weight of the block. 2. The weight of the liquid displaced is greater than the weight of the block. 3. The weight of the liquid displaced...

1. You are standing 10 meters from a light source. Then, you back away from the light source until you are 20 meters away from it. From your perspective, what has happened to the intensity of the...

You have an exciting summer job working on an oil tanker in the waters of Alaska. Your Captain knows that the ship is near an underwater outcropping of land and wishes to avoid running into it...

An 800 N board is moved a distance of 0.06 m by a screw. If the efficiency of the screw is 18%, what was the input work on the screw? A. 48 J B. 144 J C. 267 J D. 480 J

Does anyone know the answer to this question? I really need this as soon a possible

If the work output from a screw is 65 J and the work input is 90 J, what is the percent efficiency of the screw? A. 56% B. 65% C. 72% D. 138%

The horizontal component of motion of a projectile undergoes acceleration due to gravity.

A new star is discovered to be approximately 1 light year from Earth. When measured on Earth it has intensity of 1.34x10^-1 Wb/m. a) How long does the light ray take to reach us from this...

If you decrease the distance between two celestial objects by a factor of 3.5, how does the resultant gravitational force between the two objects compare to the original force? The force is ______...

Fred travels past Alice at a constant speed of 0.886c in the positive x direction. Fred is holding a meter stick at an angle of 38.8° with respect to the +x axis. What is the length (in m) and...

my question is when does a lens and mirror combination have an i3. cause there are examples in the internet that doesnt have i3 such as https://www.youtube.com/watch?v=aGHnH_4KFRE. and there...

An elephant seal weighing 22,000 N is lolling up happily on a beach. Which of the following must be true? A.) Gravity it not affecting the elephant seal at all, or he would crack through the earth...

1. You are standing 10 meters from a light source. Then, you back away from the light source until you are 20 meters away from it. From your perspective, what has happened to the intensity of the...

The first people to reach the summit of Mount Everest (Tenzing Norgay of Nepal and Sir Edmund Hillary of New Zealand) climbed the last 400 meters of the ascent in 4 hours (or about 14,400 seconds)...

a. faster than b.equal to c.slower than d. depends on the temp

I've been stuck on this question forever and I keep getting it wrong :( Please help! A truck of mass 3 tonnes is travelling at 105km/h when it hits a car of mass 1.5 tonne travelling...

Answer the following questions by writing on the blank lines the letter(s) of the word or phrase that best complete(s) the statement or answers the question. 1. ...