Explain how we know dark matter exists if we cannot see it

Although we have discussed single-slit diffraction only for a slit, a similar result holds when light bends around a straight, thin object, such as a strand of hair. In that case, a is the width of the strand.

in what way was the atlantic slave trade different from slavery in africa before european involvement

Which group contains elements that have the following characteristics: 1) At least one is a metalloid. 2) At least one forms an ion with a charge of - 2. 3) At least one is a gas. 4) At least one is a halogen.

Seen through a traditional optical telescope, the space between stars and galaxies is pitch black. But, with a radio telescope, we detect a faint background glow, almost exactly the same in all directions, that is not associated with any star,

Which of the following scenarios would not decrease the diversity within that environment? (A) A hurricane hits an island hard and wipes out a large number of animals only found on that island (B) Climate change causes the temperature of an

In a laboratory, you determine that the density of a certain solid is 5.23*10-6kg/mm3. Convert this density into kilograms per cubic meters.

List the solar objects in correct order from the Sun. Venus Earth Mercury Saturn Neptune Mars Jupiter Asteroid Belt The Sun Uranus

The power exerted by a muscle is the product of the force exerted and the velocity of contraction. The area of which of these shaded regions represents the power exerted while a weight is lifted at maximum speed?

How can you tell one element from another?

Which of the following is not an accurate statement about the attitude of teenagers when driving