How long will it be before 82.0

% of an isotope with a half life of 1250

y decays?

A pendulum makes 40 vibrations in 20 seconds. Calculate the period?

What groupings on the periodic table are made up of elements that react similarly? 1. groups/families 2. metals, nonmetals, metalloids 3. periods 4. series

What r semiconductors?

Which of the following simple machines is not properly identified? A. Scissors: lever B. Pizza cutter: wedge C. Screw: wheel and axle D. Ramp: inclined plane

If a car traveling at 60 km/h will skid 20m when its brakes lock, how far will it skid if it's traveling at 120 km/h when it's brakes lock?

What does viscosity describe? Question 4 options: A. a fluid's resistance to being heated B. the rate of evaporation of a fluid C. how much energy it takes to warm a fluid D. the density of a fluid E. a fluid's resistance to flowing

What perspective of dream interpretation is being offered? A. Freudian B. activation-synthesis C. Jungian D. motivation Not D

The vapor pressure of diethyl ether (ether) is 463.57 mm Hg at 25°C. How many grams of chlorophyll, C55H72MgN4O5, a nonvolatile, nonelectrolyte (MW = 893.5 g/mol), must be added to 187.4 grams of diethyl ether to reduce the vapor pressure to 457.

You're driving down the highway late one night at 18 m/s when a deer steps onto the road 35 m in front of you. your reaction time before stepping on the brakes is 0.50 s, and the maximum deceleration of your car is 11 m/s

You can tell when you are in an earthquake s shadow zone. a. True b. False