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?

What is the density of a 700 kg object with a volume of 649 m3? (Density: D = D = m over v.)

A cell phone charger operates at 5 volts and can deliver a maximum current of 1.0 Amp. If your cell phone has an energy storage capacity of 38.9~38.

Do all rocks stay the same throughout their life time

6. The two ends of an iron rod are maintained at different temperatures. The amount of heat thatflows through the rod by conduction during a given time interval does notdepend uponA) the length of the iron rod. B) the thermal conductivity of iron.

A new ride being built at an amusement park includes a vertical drop of 71.6 meters. Starting from rest, the ride vertically drops that distance before the track curves forward. If the velocity at the bottom of the drop is 10.

What is the name of the effect that causes water to travel at an angle to trade winds?

Two books with different masses fall off the same bookshelf. As they fall, which has more kinetic energy and why

Which of the following is an example of convection? a a hot object transferring heat to a cooler one b the rays of the Sun warming the earth c a hot oven warming the air around it d hot air rising and cooler air falling

Bob drove from home to work at 60 mph. after work the traffic was? heavier, and he drove home at 50 mph. his driving time to and from work was 1 hour and 28 minutes. how far does he live from his? job?

How to measure voltage across an ungrounded component with a two channel oscilloscope?