Three people pull simultaneously on a stubborn donkey. jack pulls directly ahead of the donkey witha force of 97.3 n, jill pulls with 60.9 n in a direction 45° to the left, and jane pulls in a direction 45 to the right with 159 n. (since the donkey is involved with such uncoordinated people, who can blame it for being stubbon? ) find the magnitude of the net force the people exert on the donkey. number what is the direction of the net force? express this as the angle from straight ahead between 0° and 90° with a positive sign for angles to the left and a negative sign for angles to the right.

Abeam of electrons with of wavelength of 7.5 x 10-6 m is incident on a pair of narrow rectangular slits separated by 0.75 mm. the resulting interference pattern is projected onto a screen 10.0 m from the slits. what is the separation of the interference maxima in the resulting interference pattern?

Which lists the main components of darwin’s theory of evolution? a. random mutations drive evolution; the evolution of a population happens slowly; organisms have common ancestors; organisms do not change. b. natural selection drives evolution; the evolution of a population happens slowly; organisms have common ancestors; organisms change over time. c. natural selection drives evolution; the evolution of a population happens rapidly; organisms have common ancestors; organisms change over time. d. random mutations drive evolution; the evolution of a population happens rapidly; organisms have common ancestors; organisms do not change.

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?