Physical Science SUSA (2020-21 A party shop delivers helium-filled balloons to homes and businesses. The owners realice from experience that on hot summer days they should inflate the balloons only three quarters full On cold winter days they can hilly
inflate the balloons. Which of the following is the BEST hypothesis to explain this observation?
Air outside the balloons leaks into the balloons
The helium gas is more active in the winter season
As the temperature increases, the helium in the balloons expands
Outdoor air pressure in the summer is less than indoor air pressure

Discuss how the hardness or softness of the landing surface is related to the time required to stop the egg

The energy released by a nuclear fusion reaction is produced when

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 740 n/m. it is initially at rest on an inclined plane that is at an angle of theta= 26 with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is uk = 0.17. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. the block's initial mechanical energy is 9.472 j.b. if the spring pushes the block up the incline, what distance l in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.