A 25-Kg Box, Sliding on a Rough Horizontal Surface, Has a a Speed

question 7

Short Answer

A 2.5-kg box, sliding on a rough horizontal surface, has a speed of 1.2 m/s when it makes contact with a spring (see the figure). The block comes to a momentary halt when the compression of the spring is 5.0 cm. The work done by the friction, from the instant the block makes contact with the spring until it comes to a momentary halt, is -0.50 J.
(a) What is the spring constant of the spring?
(b) What is the coefficient of kinetic friction between the box and the rough surface?

Understand the phases and characteristics of muscle contractions including twitch, tetanus, treppe, and tone.

Recognize the role and movement of ions, particularly calcium, in muscle contractions and relaxation.

Describe the effects of various stimuli and drugs on muscle contraction and relaxation.

Understand the concepts of latent phase, contraction phase, and relaxation phase in muscle activity.

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Definitions:

Artifact

An object made by a human being, typically of cultural or historical interest.

Pulse Oximeter

A noninvasive device used to measure the oxygen saturation level of the blood and the heart rate through a sensor attached to the fingertip or earlobe.

Blood Oxygen

A measure of the amount of oxygen carried by the hemoglobin in the blood, typically expressed as a percentage.

ECG Tracing

The graphical representation of the electrical activity of the heart over time, captured by electrodes and displayed by an electrocardiograph.