A scientist has two radioactive substances. One emits beta particles, and the other emits alpha particles. He thinks that since the alpha particles are larger, they are more dangerous to humans. What is wrong with his reasoning?

Aboxissittingonadesk. Theboxhasamassof52kg. Whatis the magnitude of the normal force acting on the box by the desk? What is the weight of the box?

One situation indicates a physical change rather than a chemical change. Which situation indicates a physical change? A) Solid copper melts to form liquid copper. B) A firecracker explodes on the fourth of July.

An electric heating element has a resistance of 16 Ω and is connected to a voltage of 120 V. How much current will flow in this circuit? a) I=E/Rb) I=120/16c) I=7.5 A

Periodic motion can BEST be defined as motion A) in three dimensions. B) along a curved path. C) repeated in intervals of time. D) in a circle at a constant speed.

a hockey player slams into a wall. If they experience a force of 100N for 8s, how much does their momentum change?

What is a result when the torques on each side of the fulcrum are equal? no motion rotate counterclockwise about the fulcrum rotate clockwise about the fulcrum iIt will teeter clockwise and counterclockwise about the fulcrum

Suppose a 58-turn coil lies in the plane of the page in a uniform magnetic field that is directed out of the page. The coil originally has an area of 0.175 m2. It is stretched to have no area in 0.100 s.

A yummy glazed doughnut is shown above. 1) where is the center of mass of this fantastic culinary delight? in the center of the hole. somewhere inside the solid part of the doughnut the center of mass is not defined in cases where mass is missing.

10. Explain the difference between the short-term effects of concussions and some of the long-term effects that scientists are recently discovering.

Like the polar bear, the walrus is a strong swimmer, although it does not have the same endurance. For short periods of time, a walrus can swim at an average speed of 9.7 m/s. How far would a walrus swim at this speed in 3.4 minutes?