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It is now 8:59 am, but when the bell rings at 9:00 am Suzette will be late for Science class for the third time this week. She must get from one side of the school to the other by hurrying down three different hallways. She runs down the first hallway, a distance of 35.0 m, at a speed of 3.50 m/s. The second hallway is filled with students, and she covers its 48.0 m length at an average speed of 1.20 m/s. The final hallway is empty, and Suzette spring its 60.0 m length at a speed of 5.00 m/s Determine if Suzette makes it to class on time by finding how many seconds she arrives before or after the bell.
Does the change in surface area of an object result in different static and kinetic frictions?
A car moves round a circular track with a uniform speed of 100km/h. Show in a diagram vectors which represents the velocity at four consecutive points A,B,C,D equally spaced round the track.is (A) the velocity and (B) the speed the same at A,B,C,D
a tennis ball is hit vertically upwards with a velocity of 20m/s.find the time taken for the ball to reach its highest point
8 A pencil 10 cm long is placed 70 cm in front of a lens of focal length +50 cm. The image is ________
A. 4 cm long and upright
B. 4 cm lang and inverted
C. 25 cm long and upright
D. 25 cm long and inverted
9. The lens of the eye forms an image on the relina that is _______
A. Real and upright
B. Real and inverted
C. Virtual and upright
D. Virtual and inverted
10. Joy is farsighted. She cannot clearly see objects closer than 60 cm. Determine the lens power (reading glasses) which will help her read a magazine at a distance of 25 cm. Assume the lens is very close to the eye.
A. +2:33 D
B. -2.33 D.
C. +5.55 D
D. -5.55 D
3. All real images of a concave mirror are ________
A . Inverted
B. Smaller than the object
C. Behind the minor
D. All of the above
4. The image of an object in front of a convex miror is ________
A. Reduced
B. Also in front of the mirror
C. Inverted
D. Enlarged
5. A penicil 10 cm long is placed 30 cm in front of a mirror of focal length -50 cm. The image is _________
A. 25 cm long and upright
B. 6.3 cm long and upright
C. 25 cm long and inverted
D. 6.3 cm long and inverted
6. An object closer to a converging lens than its focal point always has an image that in ________
A. Inerted
B. Virtual
C. The same in size
D. smaller in size
7. An object is located 10 cm from a converging lens of focal length 12 cm. The image distance is ______
A. +5.5 cm
B. - 5.5cm
C. +60 om
D. -60 cm
A torque of 7.4 N • m is applied to a wheel with a moment of inertia of 0.092 kg . cm?
. What is the resulting
angular acceleration?
What torque is required to give a disk of mass 6.1 kg and radius 0.50 m an angular acceleration of 17 rad /s2
Directions: Solve the problems below and use the rubric as your guide in answering Use a separate sheet of paper for your solution.
Focus on the Eye. The comea of the eye has a radius of curvature of approximately 0.50 cm, and the aqueous humor behind it has an index of refraction of 1.35. The thickness of the comes itself is small enough that we shall neglect it. The depth of a typical human eye is around 25 mm.
(a) What should be the radius of curvature of the cornea so that it could focus the image of a distant mountain on the retina located at the back of the eye opposite the comea?
(b) If the cornea focused the mountain correctly on the retina as described in part (a), will it also focus the text from a computer screen on the retina if the screen was placed 25 cm in front of the eye? If not, where will it focus the text, in front of or behind the retina?
A jet flies 700 km due north, then 300 km west, after which it moves 400 km due north and 800 km due east before it arrived at it's destination and landed.
(a) using vector notation, draw this movement.
(b) find the resultant displacement of the jet
