As student is trying to design an artificial eardrum for their science fair project. They made their eardrum hollow to cut down on cost and weight. When they tested how long it took their test subject to hear a beep, they found that their control ear drum made out of wood did
better than their created one. The temperature that day was 98°F.
Determine which statement supports the students the student findings.
O
A. The created eardrum performed worst because sound travels faster in solids due to the large distance between the particles.
O B. The created eardrum performed worst because sound travels faster in solids due to the small distance between the particles.
C. The created eardrum performed worst because sound travels slower in air due to the small distance between the particles.
O
D. The created eardrum performed worst because sound travels slower through air in high temperatures due to the particles moving
slower.

How much energy must a refrigerator absorb from 225 g of water so that the temperature of the water will drop from 35°c to 5°c

Astudent throws a water balloon with speed v0 from a height h = 1.76 m at an angle θ = 21° above the horizontal toward a target on the ground. the target is located a horizontal distance d = 9.5 m from the student’s feet. assume that the balloon moves without air resistance. use a cartesian coordinate system with the origin at the balloon's initial position. (a) what is the position vector, rtarge t, that originates from the balloon's original position and terminates at the target? put this in terms of h and d, and represent it as a vector using i and j. (b) in terms of the variables in the problem, determine the time, t, after the launch it takes the balloon to reach the target. your answer should not include h. (c) create an expression for the balloon's vertical position as a function of time, y(t), in terms of t, vo, g, and θ. (d) determine the magnitude of the balloon's initial velocity, v0, in meters per second, by eliminating t from the previous two expressions.

What kind of simple machine is a catapult?