Amass m = 10 kg rests on a frictionless table and accelerated by a spring with spring constant k = 5029 n/m. the floor is frictionless except for a rough patch. for this rough path, the coefficient of friction is μk = 0.49. the mass leaves the spring at a speed v = 3.4 m/s. 1) how much work is done by the spring as it accelerates the mass?
2) how far was the spring stretched from its unstreched length?
3) the mass is measured to leave the rough spot with a final speed vf = 1.5 m/s.
how much work is done by friction as the mass crosses the rough spot?
4)what is the length of the rough spot?
5) in a new scenario, the block only makes it (exactly) half-way through the rough spot. how far was the spring compressed from its unstretched length?
6)in a new scenario, the block only makes it (exactly) half-way through the rough spot. how far was the spring compressed from its unstretched length?

nec chapter 5 contains

c. information on special occupancy areas

nec chapter 6 covers

a. special equipment

which of the following rules contain the words shall or shall not and must be adhered to?

b. mandatory rules

which of the following rules identify actions that are allowed but not required and typically cover options or alternative methods?

c. optional rules

which of the following serves as the introduction to the nec and provides an overview of the book?

a. nec article 90

organizations that test products for safety are

c. nrtls

the nec is published by the

a national fire protection association

the nec is divided into

b. 9 chapters

the nec provides informative annexes for

c. informational materials and examples

two terms from nec article 100 that trainees should become familiar with are

b. labeled and listed

explanation:

weather forecasts are done by collecting data about the current state of the atmosphere mainly the temperature, humidity and wind and using meteorology, to determine the atmosphere that evolves over time. the h and l mean the high and low pressure. the red strip is a warm front. the blue strip is a cold front. the blue and red strip is a stationary front. the purple strip is a occluded front.

explanation:

prolly a beacuse the momentuem the car has increases while going down hill

3.2x10^7