Total # Posts: 10

trig
A skateboard wheel has a radius of 2.08 inches and is turning at a rate of 945 rpm. a. what is the angular speed in radians per second? in degrees per second? b. how fast is the skateboard traveling (in miles per hour)?

physique
An air plane is flying due east relative to still air at a speed of 320 km/h. There is a 65 km/h wind blowing to ward the north, as measured by an observer on the ground. What is the velocity of the plane measured by the ground observer?

Physics
first:- X=X1+0.5(Vx+V1x)t 140=0+0.5(20)t t=14s second:- a=v/t=20/14=1.43m/s2 F=m*a=1000*1.43=1430N to the south

Economics

Physics
35

Physics
30

chemistry
The hydrogen-ion concentration of a 0.25 M solution of HCN (Ka = 4.9 ´ 10-10) is I keep getting 1.1 *10^-5

chemistry
pls explain your answer Which of the following solutions would be expected to be the best conductor of an electric current at room temperature? a. 1.0 M CH3COOH b. 0.10 M CH3COOH c. 0.10 M CO(NH2)2 d. 0.10 M Na2SO4 e. 0.10 M NaCl thanks

Health Care