How long should you warm up before being physically active?

How much force is needed to stretch a spring 1.2 m if the spring constant is 8.5 n/m? 7.1 n 7.3 n 9.7 n 10.2 n

H (t) = - 16t2 128t 144. After how many seconds does the object hit the ground?

If the weight of an object that is submerged in a fluid is 10 N and the buoyant force on it is 20 N, what will happen to the object?|

What is the formula for atmospheric pressure.

From laboratory measurements, we know that a particular spectral line formed by hydrogen appears at a wavelength of 486.1 nanometers (nm). The spectrum of a particular star shows the same hydrogen line appearing at a wavelength of 485.9 nm.

Frictional force is ___of area of contact

Can you calculate gravitational potential energy by using what type of equation?

An astronomer is measuring the electromagnetic radiation emitted by two stars, both of which are assumed to be perfect blackbody emitters. For each star she makes a plot of the radiation intensity per unit wavelength as a function of wavelength.

Which of the following is true? A depression is a recession that is mild and relatively brief. The expansions and contractions of real world business cycles last varying lengths of time and often differ in magnitude.

A pure lead bar 10 cm long is maintained with one end at T=300 K and the other at 310 K. The thermoelectric potential difference thus induced across the ends is 12.8? V. Find the thermoelectric power for lead in this temperature range