Thousands of years ago, giraffes with short necks were common within giraffe populations. Nearly all giraffe populations today have long necks. This difference could be due to

Which statement describes characteristics of a concave lens? A concave lens diverges light and curves inward. A concave lens diverges light and curves outward. A concave lens converges light and curves inward.

Which will displace a greater volume of water from a full tub, a 2 gram piece of iron or a floating toy boat that weighs 2 grams? Why?

A sound wave of frequency 440 Hz is played by a musician. What is the wavelength of this sound wave (the speed of sound is given as 343 m/s) ?

Radiation occurs when what kind of energy is transferred by electromagnetic waves.

Why gravitational force at the center og earth is zero

the half-life of carbon - 14 is 5730 years. What fraction of carbon-14 would remain after 11,460 years?

An object with a mass of 10.9 kg experiences a force of 18.53 N. What is the acceleration of the object? A. 2.2 m/s2 B. 1.7 m/s2 C. 16.83 m/s2 D. 1.3 m/s2

A proton, starting from rest, accelerates through a potential difference of 1.0 kV and then moves into a magnetic field of 0.040 T at a right angle to the field. What is the radius of the proton's resulting orbit

Which of the following terms are needed to completely describe speed? Check all that apply. A. Units B. Direction C. Number D. Mass

Drivers are able to see objects ahead of them because light travels through windshields.