Calcium-51 has a half-life of 4.5 days. Only 0.75 gram remains of a sample that was initially 12 grams. How old is the sample of calcium-51? 4.5 days 9.0 days 13.5 days 18 days

Which of the following solutions is the strongest base? A. 0.1 M NaOH B. 0.1 M HNO3 C. 0.5 M KOH D. 0.5 M HCl

What is the kinetic energy (in joules) of a. 2 kg softball thrown at a speed of 40 m/sec? (answer should be in correct units)

How are the frequency and energy of an electromagnetic wave related? as frequency increases, energy increases as frequency increases, energy decreases energy remains constant as frequency changes energy and frequency are not related?

During physical activity of high intensity, your heart will beat at a percentage of its maximum rate. Whi this type of activity? A. 40%-50% 50%-70% O 70%-85% D. 85%-100%

The magnitude of the momentum of a runner is 346.5 kg•m/s. If the runner has a speed of 4.5 m/s, what is his mass? A. 73 kg B. 77 kg C. 88 kg D. 82 kg

How does uniform linear motion differ from uniform circular motion?

What is a magnetic field of electromagnet is affected by?

If three devices are plugged into one port on a switch and two devices are plugged into a different port, how many collision domains are on the switch?

A wave has a wavelength of 8 mm and frequency of 3hertz. what is its speed?

A chandelier is suspended by two identical, vertical chains side by side. The chandelier's mass is m = 6.5 kg.