Algol consists of a 3.7 msun main-sequence star and a 0.8 msun subgiant. why does this seem surprising, at least at first?

A+slab+of+a+thermal+insulator is 100cm2 in crss-section and 2cm thick. If it has a thermal conductivity of 0.1J/s/m / (C°) and a temperature difference of 100°C between opposite faces: calculate the heat flow through the slab in a day

The entire electromagnetic spectrum can be divided into seven bands: radio, microwave, infrared, visible, ultraviolet, X ray, and gamma ray (from longest to shortest wavelength).

The description for a certain brand of house paint claims a coverage of 475 ft²/gal. (a) Express this quantity in square meters per liter. (b) Express this quantity in an SI unit. (c) What is the inverse of the original quantity?

Sound waves move the most slowly through

A man stands still on a moving walkway that is going at a speed of 0.4 m/s to the east. What is the velocity of the man according to a stationary observer?

What happens to the resistance of a wire as its length increases? A. The resistance decreases. B. The resistance is not affected by a change in wire length. C. The resistance alternates between high and low values. D. The resistance increases.

What is true about molecular compounds that dissolve in water

What is a lenticular (S0) galaxy? A galaxy with a disk and central bulge like a spiral galaxy, but with no spiral arms A galaxy with a smooth brightness profile, lacking the central bulge and disk of a spiral galaxy A spiral galaxy with fuzzy and

Which process causes wells on land to become saline, making them unusable for drinking water? A. Erosion B. Echo sounding C. Eutrophication D. Groundwater infiltration

A farmer uses a tractor to pull a 150 kg bale of hay up a 15∘ incline to the barn at a steady 5.0 km/h. The coefficient of kinetic friction between the bale and the ramp is 0.40. Part A What is the tractor's power output?