How is the surface area to volume ratio maximized in lungs?

Is the process during wich a cell takes in a cell substeance by surrounding it with the cell membrane

If a spring constant is 60 N/m and an object hanging from it stretches it to 0.50 m, what is the mass of that object?

When finding the ideal mechanical advantage (IMA), the negative force not being included is ___.

A car travelling with 20 m/s, comes to halt after travelling 18 m. Find the time taken by the car to stop.

A student measures the speed of a rolling ball three times. She adds the measurements and divides by 3. What quantity did the student calculate?

A canoeist on a lake throws a 0.145 kg baseball at 20.0 m/s to a friend in a different canoe. Each canoe with its contents has a mass of 120 kg, and is at rest initially.

You short-circuit a 9 volt battery by connecting a short wire from one end of the battery to the other end. if the current in the short circuit is measured to be 18 amperes, what is the internal resistance of the battery?

A student is trying to calculate the density of a ball. She already knows the mass, but she needs to determine the volume as well. Which of the following formulas can be used to calculate the volume of the ball?

Is there such a thing as real time weather radar? why not?

Luke and Carrie are driving down a straight section of the interstate at 70 mph in Luke's new convertible. Carrie is drinking a soda in the passenger seat.