Scientists can measure the amounts of different elements found in the universe. Which element's concentration in the universe is evidence for the big bang theory?

A. Helium

B. Uranium

C. Calcium

D. Iron

Suppose a student takes a study break from astronomy homework and steps out onto his or her balcony on a fall evening.

What is a zero of the quadratic f (x) = 9x^2-54x-19?

Jawless fish and ocean reefs were devastated by which extinction? Late Devonian Ordovician-Silurian Permian-Triassic End Triassic Cretaceous-Tertiary

A solid concrete block weighs 150. N and is resting on the ground. Its dimensions are 0.400 m ✕ 0.200 m ✕ 0.100 m. A number of identical blocks are then stacked on top of this one.

How do we know the universe is a closed system?

A lorry with a mass of 5000kg accelerates to overtake a caravan on the motorway. Its acceleration is 1.5m/s². What force must the engine be providing? You can ignore the effects of friction and air resistance

Norma kicks a soccer ball with an initial velocity of 10.0 meters per second at an angle of 30.0% if the ball moves though the air for 3.2 seconds what's the horizontal distance traveled by the ball

Suppose s (t) is the position of an object moving along a line at time t is greater than or equal to 0. What is the average velocity between the times t=a and t=b? What is the instantaneous velocity at t=a?

Estimate how long it would take one person to mow a football field using an ordinary home lawn mower. suppose that the mower moves with a 1-km/h speed, has a 0.5-m width, and a field is 360 ft long and 160 ft wide. 1 m = 3.281 ft.

Badri makes the table below to review the factors that affect the electric force between objects. Which change will correct the error in Badri's table?