A mass (10 kg) slides down to the left on an
inclined 30° surface
with coefficient of friction
Ulkinetic=0.2. It is connected
over a pulley to a hanging
5 kg mass by a massless
stretch-free cord. What is
the acceleration up the plane
of the mass on the plane? (Work needed)

Which type of wave can travel without a medium

In which of these cases are the two wave points considered to be in phase with each other?

An astronaut on the moon throws a baseball upward. the astronaut is 6 ft, 6 in. tall, and the initial velocity of the ball is 3030 ft per sec. the height s of the ball in feet is given by the equation s equals negative 2.7 t squared plus 30 t plus 6.5s=−2.7t2+30t+6.5, where t is the number of seconds after the ball was thrown. complete parts a and b.