What is the frequency of an ultrasound that vibrates 30 000 times a second

Earth is closest to the sun in early January when it's winter for the Northern Hemisphere. Earth is farthest from the sun in early July when it's summer for the Northern Hemisphere.

Pendulum clocks generally run fast in winter and slow in summer

How many neutrons are contained in 2 kg? Mass of one neutron is 1.67x10-27 kg.

What allows you to evaluate a single food and to compare the nutritional value of different foods?

True or False The mucus that outlines our stomachs gets dissolved?

What force is needed to give a 0.25-kg arrow an acceleration of 196 m/s2? A. 0.25 N B. 49 N C. 196 N D. 748 N

When two or more pure substances are blended together the result is a?

10 PTS. A resistor has a value of 2.2 x 10⁵ Ω ± 20%. What is the range of possible values for this resistor?

Describe 3 uses of radioactivity isotopes

Two friends, barbara and neil, are out rollerblading. with respect to the ground, barbara is skating due south at a speed of 5.9 m/s. neil is in front of her. with respect to the ground, neil is skating due west at a speed of 1.4 m/s.