How many neutrons are in calcium

Two lasers are shining on a double slit, with slit separationd. Laser 1 has a wavelength of d/20, whereas laser 2 has a wavelength of d/15. The lasers produce separate interference patternson a screen a distance 5.00 {/rm m} away from the slits.

2000-kg car decelerated from 10 m/s to 5 m/s. What is the work done on the car?

How would the amount of carbon dioxide in the atmosphere change if they were no plants?

What regulates the movement of molecules into and out of the cytoplasm

A soccer player kicks a ball with a speed of 30 m/s at an angle of 10. How long does the ball stay in the air?

If the graph represents speed what is measured on the x and y axes

It is difficult to lift a heavy stone than the lighter one on the earth, why?

The vapor pressure of ethanol at 25 degrees C is 7.83 kPa. Calculate the vapor pressure in atm. Round answer to 3 significant digits.

According to Newton's second law of motion acceleration or an object depends upon the ___ of the object and the ___ Acting on it. I'm confused on what the blanks are. I can't find them.

What is the concentration of H + ions at a pH = 7?