Numerade

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Between-treatment differences in this study refers to differences in sprint performance (between groups). Was performance in the negative-belief treatment group better or worse than the control treatment group:

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9. A girl pulls a 12 kg wagon along by exerting a force of 15 N on the wagon's handle, which makes an angle of 20° with the horizontal. Friction provides a force of 11 N in the opposite direction. How long does it take for the wagon, which is initially at rest, to reach a speed of 4.5 m/s? (17.4 s)

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A city is faced with the following three options for a public project. Which if any of the three should be chosen, based on a benefit-cost analysis using a 50-yr life and a 10% discount rate? A B C Capital investment $8,500,000 $10,000,000 $12,000,000 Annual oper. & maint. costs 750,000 725,000 700,000 Market value at end of life 1,250,000 1,750,000 2,000,000 Annual benefit 2,150,000 2,265,000 2,500,000

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suppose that y varies directly with x. When x =30, then y=5 (a) Find the constant of proportionality k. (b) Write the linear function relating the two variables in the form y=kx. (c) Find y when x=60

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(II) A box of mass 5.0 kg is accelerated from rest across a floor at a rate of 2.0 m/s$^2$ for 7.0 s. Find the net work done on the box.

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A survey found 10% of problems in school were caused by violent actions of students if a randomly selected sample of 10 school problems were selected, find the probability that more than 2 were caused by violent actions

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Human height follows a normal distribution. The average male height is 69 inches and standard deviation is 3 inches. Find the percentage of males shorter than 66 inches

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1) Determine the magnitude of the resultant force acting on the bolt shown. 150 N 35° 120 N 80 N 30° 40° x

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If the spring constant is k = 3 N/m, how much work does it take to stretch the spring to a length of 0.15 meters?

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0.1 kg rubber ball is dropped from a window. It strikes the floor at 30 m/s and rebounds at 20 m/s. What is the magnitude of the impulse (in kg.m/s) on the ball during the collision?

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christine s.