The sound emitted by bats has a wavelength of 4.38 mm. what is the frequency in air? the speed of sound in air is 343 m/s.

Read the following paragraph from the section "No Time To Get To Safety." Many of the victims did not have enough time to climb on top of their roofs, or run to higher ground.

A spherical balloon is inflating with helium at a rate of 72 ft2/min. How fast is the balloon's radius increasing at the instant the radius is 3 ft? How fast is the surface area increasing?

What important development occurred at the end of the Pennsylvanian Epoch?

Occasionally three polar bodies are found clinging to the mature ovum. One came from an unequal division of the ovum, but from where did the other two arise? There were originally four polar bodies and one disappeared.

The Fitzhugh-Nagumo model for the electrical impulse in a neuron states that, in the absence of relaxation effects, the electrical potential in a neuron v (t) obeys the differential equation dv dt =

Between a substance and a mixture.

Two massive objects are fixed in position. A third object is placeddirectly between the first two at the position at which the totalgravitational force on the third object due to the two massiveobjects is zero.

Which statement best describes the magnetic properties of a material? Magnetic materials have many spinning, unpaired electrons Paired electrons of magnetic materials can move to other atoms Electrons of magnetic materials are strongly held by

when we examine the structures of the other terrestrial planets in our solar system, we see that their structure is similar to Earth's. Why do you think this is the case?

An ant is crawling along a straight wire, which we shall call the x axis, from A to B to C to D