A barium atom loses two electrons what charge does it have

Tim is riding a bike at a velocity of 10m/s north. As he starts to climb a hill, his velocity decreases to 5 m/s north. Is the acceleration positive or negative? Calculate the acceleration.

A person rubs her hands together and they heat up • kinetic energy • light energy • sound energy • electrical energy • chemical energy • heat energy (multiple choice)

Balance KOH+AlCl3 - - > Al (OH) 3 + KCL

How many years older will you be 1.80 billion seconds from now? (Assume a 365-day year.)

Should athletes be benched if their grades are too low, or should they be allowed to play anyway?

Summarize Newton's First Law

13. How is 0.00069 written in scientific notation? A. 69 x 10-5 B. 6.9 x 104 C. 0.69 x 10-3 D. 6.9 x 10-4

A 1300 kg sports car accelerates from rest to 95 km/h in 7.4 s. What is the average power delivered by the engine?.

Two children playing on a frictionless garden gate invent a new game called "gate". The idea is that they will get on opposite sides of the gate and each push such that the gate does not move.

What is the frequency of 20 mm microwaves? A) 100 MHz B) 400 MHz C) 15 GHz D) 73 GHz E) 98 GHz