Which kinds of lenses are in a light microscope?

a concave objective lens and a convex eyepiece lens

a convex objective lens and a concave eyepiece lens

concave objective and eyepiece lenses

convex objective and eyepiece lenses

An engineer is designing a spring to be placed at the bottom of an elevator shaft. If the elevator cable should happen to break when the elevator is at a height h above the top of the spring, calculate the value that the spring constant k should

Which of the following is not a benefit of increased energy efficiency?

An electric heater of power 1000W has a resistance of 10 ohm. calculate the magnitude of current

What is the average of this dаta: 2cm, 3.5cm, 6.1cm, 1.4 cm? and how do you get that answer?

What did the milgram experiment show

A little boy pushes a 12 kg box of library books with a constant velocity along the sidewalk by applying a horizontal force of 96N. calculate the weight, normal force, frictional force and coefficient of friction between the box and the sidewalk

Which of the following weighing balances performs measurement in a closed compartment with no air currents to disturb measurement? Spring balance Analytical balance Hydraulic balance

When you encounter a yellow light as you approach an intersection what is the safest approach to take?

If a 40-kg object is moving with a velocity of 65 m/s to the right, for how many minutes must a force of 4n be applied in the opposite direction to result in a final velocity of the object of 10 m/s in the opposite direction?

A child's train whistle replicates a classic conductor's whistle from the early 1900s. This whistle has two open-open tubes that produce two different frequencies.