(b) Fig. 3.1 shows a diagram of an arm with the hand holding a weight of 120N. 2 cm 1 1 P 15 cm V20N 120N 33 cm Fig. 3.1 The 20 N force is the weight of the forearm, acting at its centre of mass. F is the force in muscle of the upper arm. P is the point in the elbow about which the arm pivots. The distan of the forces from point P are shown. (i) By taking moments about point P, calculate the force F.

graphing motion: mastery test

209be

what is the instantaneous acceleration of

the particle at point b?

0 meters/second?

10 meters/second?

12 meters/second?

velocity imetersisecond

15 meters/second?

20

time (seconds)

answer: 0 meters/second^2

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27

part 1: which substance has a higher solubility?

a

smallest amount left undissolved atall temps in table shown most has dissolved high sol'by

t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.