1 Robots with telescoping arms are sometimes used to perform tasks(e. g., welding or placing screws) where access may be difficult forother robotic types. During a test run, a robot arm is programmedto extend according to the relationship r = 3 + 0.5 cos(4θ) and thearm rotates according to the relationship θ = −π__4t2 + πt, where r isin feet, θ is in radians, and t is in seconds. Determine (a) the velocityand acceleration of the robot tip A at t = 3 s and

Contrast the force of gravity between these pairs of objects a 1 kg mass and a 2 kg mass that are 1 m apart and two 2 kg masses that are 1 m apart

The ph is the a. independent variable b. the dependent variable c. control group

Emmy kicks a soccer ball up at an angle of 45° over a level field. she watches the ball's trajectory and notices that it lands, two seconds after being kicked, about 20 m away to the north. assume that air resistance is negligible, and plot the horizontal and vertical components of the ball's velocity as a function of time. consider only the time that the ball is in the air, after being kicked but before landing. take "north" and "up" as the positive ‑ and ‑directions, respectively, and use ≈10 m/s2 for the downward acceleration due to gravity.