a turtle crawls along a straight line, which we will call the x-axis with the positive direction to the right. the equation for the turtle’s position as a function of time is x(t) = 50.0 cm + (2.00 cm/s)t - (0.0625 cm/s^2)t^2. (a) find the turtle’s initial velocity, initial position, and initial acceleration. (b) at what time t is the velocity of the turtle zero? (c) how long after starting does it take the turtle to return to its starting point? (d) at what times t is the turtle a distance of 10.0 cm from its starting point? what is the velocity (magnitude and direction) of the turtle at each of those times?+

The four giant gas points that are made primarily of lightweight elements are

There is a theory that indicates that dinosaurs became extinct when about 65 million years ago, a large asteroid hit the earth surface. dust caused by this collision blocked the sunlight reaching the earth's surface and many forms of life became extinct due to the cold. fearing this threat, how large the radius of an asteroid should you be looking for if the dangerous asteroid size is approximately the same as the one that killed the dinosaurs? available data suggests that about 18% of that asteroid's mass ended up as a dust spread evenly over earth after eventually settling out of the upper atmosphere. about 0.0180 g/cm^2 of dust, which is chemically different than the earth's rock, covered the earth's surface. typical asteroids have a density of about 1.9 g/cm^3. now that we know the size of the asteroid, how much energy was released during impact, assuming all of it was just the kinetic energy of the asteroid right before the impact?

How much force was applied to an object if was moved 2 meters and the work done on the object was 8 joules? a. 0.25 n b. 4 n c. 6 n d. 16 n