1) The model airplanc has a mass of 3 kg, and is flying horizontally at a constant speed of 21 m/s at a radius of 2.7 m.
a) What tension is in the string?
b) If the plane's mass is doubled, what happens to the tension is part a?
c) If the plane's speed is doubled, what happens to the tension is part a?
d) If the string's length is doubled, what happens to the tension is part a?

Why is it important always to use horizontal bars in unit fractions when performing unit conversions?

The temperature at a point (x, y) is t(x, y), measured in degrees celsius. a bug crawls so that its position after t seconds is given by x = 6 + t , y = 8 + 1 3 t, where x and y are measured in centimeters. the temperature function satisfies tx(3, 9) = 5 and ty(3, 9) = 4. how fast is the temperature rising on the bug's path after 3 seconds? (round your answer to two decimal places.)

Which of the following correctly describes what happens when an atomic bomb explodes? small pieces of fissionable material are joined and form a body with a mass greater than the critical mass, the relative number of neutrons escaping decreases, and a chain reaction and explosion result. large pieces of fissionable matter are brought together quickly and form a body with a mass smaller than the critical mass, the relative number of escaping neutrons increases, and a chain reaction and explosion result.