Radium-214 decays in an alpha decay.

a. what is the mass number of the daughter isotope

A day on a distant planet observed orbiting a nearby star is 21.5 hours. also, a year on the planet lasts 59.1 earth days.

A sample of a radioactive elements must contain atoms A. with a stable nuclei B. with unstable nuclei C. in the excited state D. in the ground state

Find the law of conservation of linear momentum by using Newton's third law of motion.

If a car traveling 60 miles per hour turns east but keeps the same speed has it accelerated? explain

In the year 1178. five monks at Canterbury Cathedral in England observed what appeared to be an asteroid colliding with the moon, causing a red glow in and around it.

Which describes how radiation moves? radiation moves from a cooler object to a warmer object radiation moves from a warmer object to a cooler object radiation moves from a warm object to an object of the same temperature radiation moves from a cool

Why does the closed top of a convertible bulge when the car is riding along a highway? Why does the closed top of a convertible bulge when the car is riding along a highway? The air pressure is greater outside the car than inside.

Is a white shirt cooler or warmer in the sunlight?

A stone is thrown vertically upward with a speed of 18.0. (a) How fast is it moving when it reaches a height of 11.0? (b) How long is required to reach this height? For part A) I did: y=11m, g=9.

What object or class of objects makes up most of the solar systemâs mass?