How much leg lunges squats push ups and sits ups should a 13 year old boy do a day?

What is the total number of atoms in the formula below? NH3 one two three four

A stretched string is 1.91 m long and has a mass of 19.3 g. When the string is oscillated at 440 Hz, which is the frequency of the standard A pitch that orchestras tune to, transverse waves with a wavelength of 17.1 cm travel along the string.

A proton moves at 4.50 * 105 m/s in the horizontal direction. It enters a uniform vertical electric field with a magnitude of 9.60 * 103 N/C. Ignoring any gravitational effects, find (a) the time interval required for the proton to travel 5.

Which of the following are elements in both civil and criminal trials. (select all that apply) A. Jury B. Testimoney C. Dependent D. Plaintiff

A 610 W Carnot engine operates between constant-temperature reservoirs at 142°C and 69.9°C. What is the rate at which energy is (a) taken in by the engine as heat and (b) exhausted by the engine as heat?

How much would a 100kg man weigh on the surface of the sun where the acceleration is 274 m/s

How much current is in a circuit that includes a 9 - volt battery and a bulb with a resistance of 12 ohms?

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?