# Posts by Darcie

Total # Posts: 9

physics
The current indoor world record time in the 200-m race is 19.92 s, held by Frank Fredericks of Namibia (1996), while the indoor record time in the one-mile race is 228.5 s, held by Hicham El Guerrouj of Morroco (1997). (a) Find the mean speed in meters per second corresponding...

physics
How long will it take a motor 1500 watt motor to lift a 500kg elevator 30 meters? Give your answer in minutes.

physics
Calculate the work required to lift a 20kg object from the floor to a height of 2 meters. Give your answer in Joules

physics
The 20kg object is dropped from a height of 2 meters. Find its speed when it hits the ground. Give your answer in meters per second.

physics
A block of mass m = 4.30 kg is released from rest from point circle a and slides on the frictionless track shown in the figure below. (Assume ha = 5.20 m.) B=3.20 c=2.00 (a) Determine the block's speed at points circle b and circle c. point circle b Y point circle c (b) ...

physics
A 59.0-kg runner has a speed of 3.20 m/s at one instant during a long-distance event. (a) What is the runner's kinetic energy at this instant? KEi = J (b) If he doubles his speed to reach the finish line, by what factor does his kinetic energy change? KEf KEi =

Chemistry
Molarity of the first and volume of the first = molarity of the 2nd

math
my daughter is doing homework using greatest common factor, greatest common divisor, and prime factorization. She has this problem: Computers in the research room of the history museum are 30 wide, 30 inches apart and at either end of a row 30 inches from the wall. How many ...