12. A car is on the 5th floor of a parking lot. the mass of the car is 900kg and the height of each floor of the parking lot 2.5m a) when it is parked in the parking space.
at a given moment, the car begins to descend towards the exit, with a constant speed of 20 km / h.
b) Calculate its mechanical energy passes through the 3rd floor of the car park
c) Calculate its mechanical energy at the moment it reaches the output

What type of reaction fuels the processes seen here?

In november 1987, a massive iceberg broke loose from the antartic ice mass and floated free in the ocean. the chunk of ice was estimated to be 98 mi long, 25 mi wide, and 750 ft thick. a typical backyard swimming pool contains about 24,000 gallons of water. how many of these pools could you fill from the water in this iceberg? (assume the iceberg is a rectangular solid of the above dimensions and consists of water only). express answer in scientific notation.

Calculate the mass of 0.750 mol of the following substance. na3po4.