Which scientists discovered the two radioactive elements radium and polonium

Radar devices are used by law enforcement to be sure that individuals are driving safely. they tell the officer how fast the vehicle is traveling at that specific moment in time. the radar device determines the vehicle's instantaneous speed.

If you see a sedimentary rock outcrop and red layers of sand are on top of pale yellow layers of sand, what do you know for sure about the ages of the two layers?

A 1 kg ball is thrown into the air with an initial velocity of 30 m/s. How much kinetic energy does the ball have?

Antitussives are best used to treat a

A boy pushes on a parked car with a force of 200 n. the car does not move. how much work does the boy do on the car?

Calculate the wave speed i the wavelength = 64m and the wave period = 4s

Why do you want the water to drip off the metal before it is placed in the calorimeter? (A) The mass and the initial temperature of the calorimeter water will be incorrect and affect the calculation of the specific heat capacity of the metal.

a block of wood is found to have dimensions of 6.21 cm x 4.63 cm x 5.34 cm. Calculate the volume of the block

In which sentence is the word accept used correctly? a. If you offer me a box of dark chocolates, I will gladly accept it. b. Javier loves chocolates, accept for the ones filled with coconut. c.

The formula to create a directed vector is a) Source - Destination b) Source + Destination c) Destination - Source d) Destination + Source