Q: 2 cars A and B race each other the car A ran for2 minutes at a speed of 7.5 km/h , then the car came to rest for 56 minutes and again ran for 2 minutes at the speed of 7.5 km/h. find the average speed of the car. please answer fast with explanation

Consider an ordinary, helium-filled party balloon with a volume of 2.2 ft3. the lifting force on the balloon due to the outside air is the net resultant of the pressure distribution exerted on the exterior surface of the balloon. using this fact, we can derive archimedes’ principle, namely that the upward force on the balloon is equal to the weight of the air displaced by the balloon. assuming that the balloon is at sea level, where the air density is 0.002377 slug/ft3, calculate the maximum weight that can be lifted by the balloon. note: the molecular weight of air is 28.8 and that of helium is 4.

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

Marvin records scientific data about lake superior. for which property has marvin forgotten to use an si unit of measurement? shore length high temperature low temperature annual precipitation