Two friends, Al and Jo, have a combined mass of 181 kg. At an ice skating rink they stand close together on skates, at rest and facing each other, with a compressed spring between them. The spring is kept from pushing them apart, because they are holding each other. When they release their arms, Al moves off in one direction at a speed of 0.895 m/s, while Jo moves off in the opposite direction at a speed of 1.35 m/s. Assuming that friction is negligible, find Al's mass.

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz.

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.

You are a sales representative for a company that makes a new alternate fuel for vehicles. you have prepared a presentation for the environmental engineers to sell your new product. what question do you expect the audience to ask regarding whether the new fuel will cause less damage to the environment? a. do we have to change any parts of the vehicle to use this alternate fuel? b. will the vehicles get better fuel mileage with the alternate fuel? c. how much greenhouse gas does your fuel produce compared with current fuel sources? d. is the alternate fuel more expensive than fossil fuel?