An elevator cab weights 6000 N. It is lifted by a 5 kW motor. What time is needed for the cab to ascend a distance of 40 m

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."

colorectal cancer may also develop from areas of abnormal cells in the lining of the colon or rectum. this area of abnormal cells is called dysplasia and is more commonly seen in people with certain inflammatory diseases of the bowel such as crohn's disease or ulcerative colitis.

when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.