What is the source of radioactivity for uranium?

If igneous rock is placed under conditions of extreme heat and pressure, what type of rock will it become

A person is initially driving a car east down a straight road. the magnitude of the instantaneous acceleration is decreasing with time, but the direction of the acceleration is always to the east. the speed of the car is

What might happen if sunlight didn't strike the moon at different angles?

I want to know how far I traveled on my 21-speed bike. I know the speed I went (2.5 m/s) and I know that my bike ride was 45 minutes long.

A runner moves west with an initial velocity of 4 m/s. She accelerates 3 m/s2 for 30 seconds. The runner's final velocity is

Find the current Voltage VD and current ID in the following circuit assuming (a) ideal diode. (b) Constant voltage drop model with Von = 0.75V (c) using the exponential model (I_0=1*10^ (-14)). Verify your results through Multisim simulation

Suppose two stars are located in region a of the h-r diagram shown in the figure below. Star X appears much dimmer that Star Y as seen from Earth. Which Star can be inferred to be nearer to Earth, and how do you know?

A student examining a joint observes collagen-rich connective tissue fibers linking the bones, but finds no synovial cavity. Which structural classification fits the observed joint?

How to identify additional materials

Tarzan runs at 6 m/s and grabs a vertical vine (negligible mass) 4.1 m long which is tied to a tree at the top. Tarzan swings up. Determine the maximum height Tarzan will swing up and the angle the vine makes respect to vertical.