Most of the motion generated by joints in the human body are examples of levers. an example of a third class lever is the forearm; the force which generates the motion is located in‑between the pivot point and the resistance force. the elbow acts as the pivot point, the biceps muscle pulls up on the forearm to move the mass which is held in the hand. imagine someone is holding an object in her hand with her forearm horizontal and her upper arm vertical so her elbow creates a 90 ∘ angle. if her biceps attach to her forearm 0.0425 m from the elbow and make an angle of 30.0 ∘ with the vertical while a 3.14 kg mass is held in her hand 30.75 cm from the elbow, what force f is exerted by the biceps muscle? ignore the mass of the forearm.

Describe the path of the electric current through a circuit?

The frequency of vibrations of a vibrating violin string is given by f = 1 2l t ρ where l is the length of the string, t is its tension, and ρ is its linear density.† (a) find the rate of change of the frequency with respect to the following. (i) the length (when t and ρ are constant) (ii) the tension (when l and ρ are constant) (iii) the linear density (when l and t are constant) (b) the pitch of a note (how high or low the note sounds) is determined by the frequency f. (the higher the frequency, the higher the pitch.) use the signs of the derivatives in part (a) to determine what happens to the pitch of a note for the following. (i) when the effective length of a string is decreased by placing a finger on the string so a shorter portion of the string vibrates df dl 0 and l is ⇒ f is ⇒ (ii) when the tension is increased by turning a tuning peg df dt 0 and t is ⇒ f is ⇒ (iii) when the linear density is increased by switching to another string df dρ 0 and ρ is ⇒ f is ⇒

The arrival of in the early days of europa’s existence could have formed its ocean. it is likely that the water experienced similar to earth. it is also possible that this water is retained beneath europa’s surface and in its atmosphere due to europa’s . 1.) a. precipitation b. water vapor c. icy debris 2.) a. gravitational compression b. biochemical cycling c. radiogenic heating 3.) a, gravity b. magnetic field c. heat energy for plato