9. It has been suggested that night shift-workers show more variability in their output levels than day workers (σ2N > σ2D). Below, you are given the results of two independent random samples Hypothesis Test for Two Populations including t-Test for μ1-μ1 t-Test for μd F-Test for Night Shift (N) Day Shift (D) Sample Size 9 8 Sample Mean 520 540 Sample Variance 38 20 State the alternative hypotheses (HA) to be tested. Group of answer choices a. b. c. d.
9) Sketch the torque speed curve for a typical induction motor. Label the synchronous speed (N) rated torque (TR) rated speed (NR)
A rifle with a weight of 25 N fires a 5.5-9 bullet with a speed of 230 m/s. (a) Find the recoil speed of the rifle. m/s (b) If a 800-N man holds the rifle firmly against his shoulder, find the recoil speed of the man and rifle. m/s
9. A shift to the right of the demand curve could be caused by a(n): A decrease in tastes or preferences. B decrease in the price of a substitute. C increase in income if the good is normal. D increase in the price of a complement. 10. Suppose that summer in a resort town is very rainy. We can expect demand to shift and the equilibrium price for hotels to . A left; fall B left; rise C right; fall...
A flywheel has a moment of inertia of 210 kg · m2 and the speed of 600 rpm. An aggregate is connected to the wheel with the moment of inertia 70 kg · m2. Calculate the system's new speed. How many percent of it original mechanical energy has the flywheel left after the connection? ( Answer 450 rpm; 75%)
A 210-N sphere 0.20 m in radius rolls without slipping 6.0 m down a ramp that is inclined at 25° with the horizontal. What is the angular speed of the sphere at the bottom of the slope if it starts from rest? answer in rad/s
A sample of 400g of radioactive lead-210 decays to polonium-210 according to the function A(t)=400e−0.032t, where t is time in years. Find the amount of radioactive lead remaining after (a) 4 yr, (b) 6 yr, (c) 15yr. (d) Find the half-life.
s=25
9. Find I? 10 v 1도 210 0 3100 2SO | 110V 210 0 | 3 3100
3. A 33-KW motor, using a set of gears, drives a shaft at a speed n, as illustredted in Fig. P3, with a safety factor = 2.2 what will be the total angle of twist between A and B. Given: G = 82 GPa, Typ = 210 MPa, n = 1500 rpm? (a) 16.64", (b) 18.64", (c) 14.64°9, (d) 10.64", (e) none of above -2m- 5 m с Motor 25 kW 8 kW off off 33 kW Fig. P3
A circular coil that has N = 210 turns and a radius of r = 9.00 сm lies in a magnetic field that has a magnitude of Bo = 0.0600 T directed perpendicular to the plane of the coil. What is the magnitude of the magnetic flux Og through the coil? OB = 0.321 The magnetic field through the coil is increased steadily to 0.180 T over a time interval of 0.515 s. What is the magnitude El of the...