When a high-mass star explodes, which of the following is left over in the center?

A. Black hole

B. Neutron star

C. White Dwarf

D. either a or b

A girl stands on the roof of 55m tall building and throws a baseball at an angle of 30° above horizontal at an angle of 10m/s. a. How long the ball is in air.

A cyclist rides her bike 7 mi east, and then 2 mi north before taking a break. Then she rides 5 mi east and then 3 mi north. What are the magnitude and direction of the cyclist's resultant displacement? magnitude: 13.0 mi; direction: 22.

Public transportation is the most fuel efficient way to get to your local store. T or F

If a 4 Ω resistor, a 7 Ω resistor and a 12 Ω resistor are connected in parallel, which resistor has the most current in it? 4 Ω 7 Ω 12 Ω They all have the same.

If a machine exerts a force of 250 N on an object and no work is done, what must have occurred?

What is the critical angle c for total internal reflection if the material is clear acrylic, with a refractive index of 1.5?

What is happening if energy input remains constant and voltage remains the same in a circuit, but the current decreases? A. The resistance has increased. B. The volts have decreased. C. The power has increased.

The velocity - time graph of a ball of mass 25g moving on road is as given below: (a) How much force does the road exert on the ball to bring it to rest? (b) What is the direction of the force exerted by the road?

A spring required a force of 5.0 n to compress it 0.1 m. How much work is required to stretch the spring 0.4 m?

ou purchase a rectangular piece of metal that has dimen - sions 5.0 * 15.0 * 30.0 mm and mass 0.0158 kg. The seller tells you that the metal is gold. To check this, you compute the average density of the piece.