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

Consider a bee with the mean electric charge found in the experiment. this charge represents roughly how many missing electrons?

A dynamite blast propels a heavy rock straight up with a launch velocity of 160ft/sec (about 109 mph). Write a position for the height of the rock. a. How high does the rock go? b.

Given a selection of ionizing particles at the same energy, which is biologically most harmful? Select one: a. alpha particles (helium nuclei) b. X-rays c. Beta particles (electrons) d. protons e. slow neutrons

Radiation makes it impossible to stand close to a hot lava flow. Calculate the rate of heat transfer by radiation from 1.00 m^2 of 1250°C fresh lava into 34.0°C surroundings, assuming lava's emissivity is 1.00

What happens to the density of ocean water when salinity increases? A. It increases. B. It decreases. C. It becomes variable. D. It doesn't change.

A person lifts a 4.5 kg cement block a vertical distance of 1.2 m and then carries the block horizontal - ly a distance of 7.3 m. determine the work done by the person and by the force of gravity in this process.

A tree is standing in the middle of a meadow. As you watch, the wind begins to blow and the tree bends. Which statement best explains how you could tell that a net force was acting on the tree? OA) The tree had momentum.

A 5.1 kg black bear cub weighs 49.98 N. The cub is carried by its mother up into the safety of a white pine tree.

Which location is associated with persistent upwelling of cold water to the ocean surface?

What type of electromagnetic radiation is associated with the peaks in this spectrum chem 237?