The atomic number of krypton (kr) is 36, and its mass number is 84. how many neutrons does it have? 18 36 48 72

A heat engine receives heat from a source at 1100 K at a rate of 400 kJ/s, and it rejects the waste heat to a medium at 320 K. The measured power output of the heat engine is 120 kW, and the environment temperature is 25∘C.

What is terminal speed? When a skydiver has reached terminal speed, what is the are resistance equal to? What is the skydiver's acceleration? Be sure to use at least 3 to 4 complete content related sentences.

What is the escape speed for an electron initially at rest on the surface of a sphere with a radius of 1.3 cm and a uniformly distributed charge of 2.3 ✕ 10-15 C.

A standard frequency for tuning musical instruments is 440 Hz for the pitch of A, denoted A4. What is the length, in meters, of the steel rod that produces the pitch A4 as its fundamental longitudinal resonance?

A BASE jumper runs off a cliff with a speed of Which of the following is closest to his speed after 0.5 seconds? A) 10 m/s B) 8 m/s C) 6 m/s D) 3 m/s E) not given

An alpha particle travels at a velocity of magnitude 550 m/s through a uniform magnetic field of magnitude 0.045T. (An alpha particle has a charge of charge of + 3.2 x 10-19 C and a mass 6.

A woman tries to put lipstick in the car. She has to come to a fast stop, and the lipstick falls to the floor and rolls forward, under the brake pedal. She dies. Why does this happen?

The slope of the line on any speed vs time graph is equal to the objects?

True or False? a globular cluster is a group of older stars that are clustered together.

The doppler effect is the change in observed frequency due to