1.Which car has the greatest efficiency?(1 point)
a 900 kg car that travels 15 km per liter of fuel
a 900 kg car that travels 20 km per liter of fuel
a 1,200 kg car that travels 15 km per liter of fuel
a 1,200 kg car that travels 20 km per liter of fuel
2.Why are incandescent light bulbs considered to be lower efficiency than LED bulbs?(1 point)
A greater percentage of the energy output of the incandescent bulb goes toward heat.
A smaller amount of energy is wasted by the incandescent bulb.
A greater amount of energy is required for the same light output from the LED bulb.
A smaller percentage of the energy output of the LED bulb goes toward light.
3.What can be done to improve the efficiency of a ramp?(1 point)
Make it shorter and steeper.
Add a rough surface.
Smooth the surface.
Insulate the surface with foam.
5.A pulley system is operating at only 50% efficiency. How could the efficiency be increased? (1 point)
by adding more pulleys to the system
by decreasing the amount of weight being lifted
by having a second person pulling on the rope
by reducing the friction on the pulleys
1. a 1,200 kg car that travels 20 km per liter of fuel
2. A greater percentage of the energy output of the incandescent bulb goes toward heat.
3. Smooth the surface.
4. fulcrum
5. by reducing the friction on the pulleys
help there are coyotes outside my home and my dog won't be quiet.
Ayo its the person who stays up til 6am and pulls all nighters bc they physically cant sleep bc this school is so stressful and is so thankful when she finds the answers online and my parents say I like like a raccoon now bc my eyes are so dark
Lost is right!
1,a 1,200 kg car that travels 20 km per liter of fuel
2, a greater percentage of the energy output the incandescent bulb toward heat
3,smooth a surface
4,fulcrum
5,by reducing the friction on the pulleys