A 500g sample of Potassium-40 is left to decay radioactively. After 3.9 x 109 years, about how many grams of Potassium-40 are expected to remain? [The half-life of Potassium-40 is 1.3 x 109 years.]

Terry is convinced that heating peanut butter will increase its mass so that it covers more bread. Is he correct? A. No, mass is only equal to temperature B. No, heating matter does not affect mass C. Yes, mass is directly relates to temperature D.

You hit someone with a force of 191 n. how much force is exerted on you? answer in units of n.

Define the term Hysteresis

When a cup is placed on a table, which force prevents the cup from falling to the ground?

Identify the factors that cause technology to progress

As stream velocity decrease, which factor will likely increase? A) erosion of the stream bank B) deposition of material in the stream C) amount of material carried downstream D) size of the particles carried downstream

What cells in the nervous signals travel through the nervous system

A mechanic pushes a 3.60 ✕ 103-kg car from rest to a speed of v, doing 5,130 j of work in the process. during this time, the car moves 21.0 m. neglecting friction between car and road, find v and the horizontal force exerted on the car.

Anika asks Eva to roll a basketball and then a bowling ball to her. Which requires more force to roll, and why?

Why does a buoyant force act on every object in a fluid? Pressure pushing up on the bottom of the object is greater than the pressure pushing down on the top.