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Questions in physics

[Done] How much force is needed to move a box with an acceleration of [tex]1.5 \, \text{m/s}^2[/tex] and a mass of [tex]50 \, \text{kg}[/tex]?

[Done] Please can someone explain to me: What is work done?

[Done] Bats use ultrasound in echolocation. This sound is characterized by: A. low frequency B. low amplitude C. high frequency D. high amplitude

[Done] Vitellium (Vi) has the following composition: - Vi-188: 187.9122 amu; 10.861% - Vi-191: 190.9047 amu; 12.428% - Vi-193: 192.8938 amu; 76.711% Based on this data, what can you predict about the average atomic mass of vitellium?

[Done] A steel block has a volume of [tex]0.08 \, \text{m}^3[/tex] and a density of [tex]7,840 \, \text{kg/m}^3[/tex]. What is the force of gravity acting on the block (the weight) in water?

[Done] Why does a compass point to the east or west of true north in different locations?

[Done] If an object's speed is constant and the direction is in a straight line, what type of velocity does the object have?

[Done] When two or more forces act together on an object, what do they combine to form?

[Done] Which type of force pulls objects toward one another?

[Done] What does work depend on in scientific terms?