List the forces that are act on a hot-air balloon to ist keep it on the ground.

What has more thermal energy a small balloon or a large balloon

A certain battery can power a 100 ohm-resistance device for 4 hours. how long can the battery power a 200 ohm device?

What force is used to make the back-and-forth motion of a swing higher? A. scrape B. pull C. push

A 25N force is applied to a bar that can pivot around its end. The force is r=0.75 m away from the end of an angle at 0 = 30. what is the torque on the bar?

What are some everyday life materials that contain nitrogen

Consider two cars, a 700kg Porsche and a 600kg Honda Civic. The Porsche is speeding along at 40 m/s (mph) and the Civic is going half the speed at 20 m/s.

Which statement about an electron in the 4d state is correct? A. The magnitude of its orbital angular momentum is 6√ℏ. B. The largest orbital angular momentum it could have in any given direction is 4ℏ. C.

A D note has a frequency of 587.33 Hz. Calculate its wavelength in meters. The speed of sound is 343 m/s

A cyclist allows his bike to roll down a hill without pedaling. Towards the bottom of the hill he applies his brakes. The bike comes to a stop. Applying the brakes causes the brakes to warm up. Describe the energy transfers that have occurred.

An object is placed in a fluid and then released. Assume that the object either floats to the surface (settling so that the object is partly above and partly below the fluid surface) or sinks to the bottom.