An amusement park ride consists of a rotat- ing circular platform 6.9 m in diameter from
which 10 kg seats are suspended at the end of
2.5 m massless chains. When the system ro-
tates, the chains make an angle of 39.3° with
the vertical.
The acceleration of gravity is 9.8 m/s2.
O
What is the speed of each seat?
Answer in units of m/s.

Achild throws a ball with an initial speed of 8.00 m/s at an angle of 40.0° above the horizontal. the ball leaves her hand 1.00 m above the ground. how long is the ball in flight before it hits the ground?

Three different objects, all with different masses, are initially at rest at the bottom of a set of steps. each step is of uniform height . the mass of each object is a multiple of the base mass : object 1 has mass 4..00m , object 2 has mass 1..96m , and object 3 has mass . when the objects are at the bottom of the steps, define the total gravitational potential energy of the three-object system to be zero. if the objects are then relocated as shown, what is the new total potential energy of the system? each answer requires the numerical coefficient to an algebraic expression. each algebraic expression is given using some combination of the variables , , and , where is the acceleration due to gravity. enter only the numerical coefficient. (example: if the answer is 1..23mgd , just enter 1.23)

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.