You swing a 2.2 kg stone in a circle with radius 75 cm. At what speed do you need to swing it so its centripetal acceleration will be 9.8 m/s?

2.7 m/s

8.6 m/s

27.1 m/s

7.35 m/s

Consider a keen little boy who is having a wagon race with a friend. He starts from rest and then begins to accelerate to the left.

Calculate the wavelength of a neutron that has a velocity of 200. cm/s. (the mass of a neutron = 1.675 * 10-27 kg and h = 6.63 * 10-34 j s).

How to determine how hot or cold a star is?

What is peer review? ...

Consider the chemical reaction involving graphite as the reactant: 2C (s) + O2 (g) → 2CO (g) ΔH = - 110.5kJ According to the Law of Conservation of Energy, what would be the ΔH if the reaction were reversed? A) - 221.0 kJ B) - 55.

Which of these atoms is most likely to share electrons with other atoms?

A rapidly moving cold air mass meets a slowly moving warm air mass and forms a front. what will most likely occur at this front?

It is believed that during the late Cretaceous period sea levels rose drastically resulting in about a third of the Earth's present land masses being underwater. Which of the following types of evidence supports this theory? A.

On a drive from one city to? another, victor averaged 39 mph. if he had been able to average 72? mph, he would have reached his destination 11 hrs earlier. what is the driving distance between one city and the? other?

A motorcycle has a constant speed of 24.3 m/s as it passes over the top of a hill whose radius of curvature is 182 m. The mass of the motorcycle and driver is 391 kg.