Why is it impossible to "defy gravity"?

a. There is no gravity.

b. You can't defy gravity without going to another planet.

C. Gravitational force exists every place where there are two objects.

d. Nothing has enough force to resist gravity.

Two radioactive nuclei A and B are present in equal numbers to begin with. Three days later, there are 4.04 times as many A nuclei as there are B nuclei. The half-life of species B is 1.37 days. Find the half-life of species A (in days).

What is the pH of a solution with [H+] = 2.3 10-12? A-2.3 B-12 C-11.64 D-1.64

When did most of the cratering on the moon occur?

you add 8950 J of heat to 174 g of iron. What is the temperature of the iron (c=452 J / (kj * C degrees)) ?

Explain using your own why you, always give a unit when reporting measurement

A skydiver with a mass of 60 kg jumps from an airplane. Five seconds after jumping the force of air resistance is 300 N. What is the acceleration of the sky diver, five seconds after jumping?

How many basic wave forms are there? A.) 1 B.) 2 C.) 3 D.) 4

How much power is reqired to lift a 10-n box 2 meters

Dolphins and other sea creatures can leap to great heights by swimming straight up and exiting the water at a high speed. A 200 kg dolphin leaps straight up to a height of 7.8 m.

An example of renewable energy resource is ... A - uranium B - Wind C - natural gas