One end of a 50 kg mass is attached to two vertical springs in parallel. each spring has a spring constant of 20 n/m. when the spring is pulled back and released, what is the spring’speriod?
a. 14.049 s
b. 7.02 s
c. 14 s
d. 7.0 s
e. 0.14 s

As part of your daily workout, you lie on your back and push with your feet against a platform attached to two stiff springs arranged side by side so that they are parallel to each other. when you push the platform, you compress the springs. you do an amount of work of 79.0 j when you compress the springs a distance of 0.230 m from their uncompressed length. (a) what magnitude of force must you apply to hold the platform in this position? (b)how much additional work must you do to move the platform a distance 0.230 m farther? (c) what maximum force must you apply to move the platform a distance 0.230 m farther?

The mantle is made up of which structural zones?

Aturntable that spins at a constant 74.0 rpm takes 3.10 s to reach this angular speed after it is turned on. find its angular acceleration (in rad/s2), assuming it to be constant, and the number of degrees it turns through while speeding up.