How many days will it take for one half of the original amount of a radioactive substance to decay if the half-life is 30 days?

a. 3 days

b. 15 days

c. 30 days

d. 60 days

What are the components of earths life support system

11) Which statement about covalent bonds is true? A) Covalent bonds are generally weaker than ionic bonds because they form full oppositely charged particles.

How much heat is released when 30 g of water at 96°C cools to 25°C? The specific heat of water is 1 cal/gºC. Oa b ano 2,130 cal 0.213 cal -2,130 cal -0.213 cal

In a chemical reaction, the reactants are substances that undergo the reaction, and the products are substances that are formed during the reaction. The table below shows the reactants and products of several different chemical reactions.

What is the magnetic field in the middle of the capacitor plates at a distance d from the center, as a function of time t?

A solid round bar with diameter of 2-in has a groove cut to a diameter of 1.8-in, with a groove radius of 0.1-in. the bar is not rotating.

If a pilot pulls her 12.0 kg rollaboard suitcase along the ground with a force of 25. N for 10 M. The handle she pulls on makes an angle of 36.5 degrees with the horizontal. How much work does she do over the ten meter distance?

What happens to the density when water is poured into a empty glass?

A British newspaper was interested in whether groups of people who differed in social standing were treated differently when they complained to organizations about poor service they had received.

During combustion, a fuel's electromagnetic energy is converted into thermal energy.