Astronomers are always making comparisons between measurements in astronomy and something that might be more familiar. for example, the hipparcos web pages tell us that the measurement accuracy of 0.001 arcsec is equivalent to the angle made by a golf ball viewed from across the atlantic ocean, or to the angle made by the height of a person on the moon as viewed from earth, or to the length of growth of a human hair in 10 sec as seen from 10 meters away. use the ideas in example 19.2 to verify one of the first two comparisons.

According to newton's second law, when the same force is applied to two objects of different masses, a the object with greater mass will experience a great acceleration, and the object with less mass will experience an even greater acceleration, b. the object with greater mass will experience a smaller acceleration, and the object with less mass will experience a greater acceleration, c. the object with greater mass will experience a greater acceleration, and the object with less mass will experience a smaller acceleration, d. the object with greater mass will experience a small acceleration, and the object with less mass will experience an even smaller acceleration.

The respiratory system removes oxygen and water from the body. select the best answer from the choices provided t f

5g of ammonium nitrate was dissolved in 60g of water in an insulated container. the temperature at the start of the reaction was 23.0°c and at the end it was 19.0°c. calculate the energy absorbed by the reaction.