Physics Answers

you are below deck in a ship, in a room with no windows. there are lamps hanging down from the ceiling and there are marbles on the flat floor. by seeing if the lamps hang straight down and if the marbles start to move about, what can u tell?

A. you can tell whether you are moving or at rest.

B. you can tell whether you are accelerating or not.

C. you can tell whether you are changing speed but cannot tell whether you are changing direction.

D. you can tell whether you are changing direction but cannot tell whether you are changing speed.

a child of mass 40 kg slides down a water slide that is 15 m high. at the bottom her velocity is 9.7 m/s. approximately how much energy was "lost" due to friction?

an object of mass 60 kg is raised 12 m and then released. assuming no losses due to air resistance, what is its velocity two-thirds of the way down?

what is the work done by gravity when a wooden block of mass 2 kg slides 3 m down a slope inclined at 30 degrees?

Determine the image distance for a 10.00-cm tall object placed 30.5 cm from a convex lens having a focal length of 16.0 cm.

how many minutes would it take a radio wave to travel from the planet venus to earth.? (average distance from venus to earth= 28 million miles) 1 kilometer (km)= 0.6214 mile (mi), 1 km = 1000 m

A cigarette labeled 100’s means that each stick is 100mm long. What will be the total length in inches of all the sticks in a pack if they are placed end to end in a column. Assume that one pack contains 20 sticks.

a laser emits light of frequency 4.7 x 10¹⁴ sec-1. What is the wavelenght of the light in nm? Inanometer (nm) = 1 x 10 -⁹ m

a global positioning system (GPS) receives a radio signal from a satrlite in 1.7 x 10-⁴ seconds. Assuming vacuum conditions for simplicity, how far is the the GPS receiver from the satellite?

Trisha who is 1.7 m tall stands in front of a plane mirror at a distance of 2 m. What is her magnification? Write your answer in whole number.