4

The diagram shows a girl lifting a box of welght 50 N from a low shelf to a high shelf.

high shelf

low shelf

11.8m

50N

0,6 m

How much work is done on the box?

A. 30J

B. 60J

C. 90J

D. 120J

What is the mass of a proton neutron electron

List the major functions of the skeleton system

a relative density bottle has mass of 14.0g when empty. Its mass is 58g when full of turpentine and 64g when full of water. Calculate the density of turpentine.

Given the following students' test scores (95, 92, 90, 90, 83, 83, 83, 74, 60, and 50), identify the mean, median, mode, range, variance, and standard deviation for the sample

At what temperature is the fahrenheit scale reading equal to twice that of the celsius?

How many layers of material were the roads made of? a. two c. four b. three d. five

Red light has a shorter wavelength than yellow light.

Approximately what is the parallax angle of a star that is 20 light-years away?

If the Earth and distant stars were stationary (motionless) in space, what would we observe about the wavelength from these stars? A. Wavelengths measured would match the actual wavelengths emitted. B.

Two fire trucks with sirens speeds towards and away from an observer. Which statement is true involving the Doppler effect observed by the observer?