2-FALL2007MIDTERM2

# 2-FALL2007MIDTERM2 - PHY1301/1311B PHY1321 II MIDTERM TEST...

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Unformatted text preview: PHY1301/1311B PHY1321 II MIDTERM TEST II MIDTERM TEST November 13 November 13 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ : R E B M U N T N E D U T S _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ s e : E t M u n A i N m m a 0 x T 0 e 1 N : k E n o o D o i d a r g t s e t r T e d a r g e h t d r a w u E o o E t y H t n f o % S u o N c 6 0 O t 5 R s e : T B S N N . s O A n o i I C t s T S S e u E G q l l N a t U I Q S p E U m e t C S t A I O N . e O u l H I a C T v E S t n L E i o P U p e I Q m T E a s L S e U E h t o r e T T S u s o D l R C A P M H f a d 1 e t b U T e r R a s E n W o i t s S e N u q A l l 1 Two persons pull on the ends of a spring scale. They each exert 200 N of force. What does the scale read in N? a. 200 b. 300 c. 400 d. 600 e. 800 2. The horizontal surface on which the objects slide is frictionless. If F = 6N what is the tension in N in string 1? a.15 d. 45 b. 30 e. 25 2 2F 1 2M M 3F 3M c. 40 3. A 1500 kg car is moving at 21 m/s when the brakes are applied. If the coefficient of friction between the car and the road is 0.37, what time in s does it take the car to stop? a. 6.8 b. 6.4 c. 6.2 d. 5.8 e. 5.4 4. A 1.0 kg particle is moving horizontally with a speed of 5.0 m/s when it strikes a vertical wall. The particle rebounds with a speed of 3.0 m/s. What is the magnitude of the impulse in N ⋅ s delivered to the particle? a. 24 b. 32 c. 40 d. 30 e. 8.0 5. A 12 g bullet is fired into a 3.0 kg ballistic pendulum initially at rest and becomes embedded in it. The pendulum subsequently rises a vertical distance of 12 cm. What was the initial speed of the bullet in km/s? a. 0.024 b. 0.38 c. 0.44 d. 0.50 e. 0.54 F( x ) (N) 40 6. An object moves from x = 0 m to x = 7 m subject to the force shown in the diagram. How much work in J is done on the object by the force when the object moves from x=3m to x=5m? a. –40 d. 20 b. –20 e. 40 c. 0 20 0 1 2 3 4 5 6 7 x (m) –20 –40 7. A skier is initially moving down a 5.0° slope at 15 m/s. If the coefficient of friction between her and the slope is 0.18, what is her stopping distance in m? a. 1200 b. 560 c. 250 d. 125 e. 64 A 2 . e d a r g t s e t r u o y f o % 0 5 : S R E W S N A G N O T R A P L A11003 . e c i h o c r u o y f o s m e l b o r p v e i f v e l o . S l a c i t n e d i s i m e . N O I T A N I M A X E R U O Y F O E G A P R E V O C E H T N O G N I D A R G R O F S l b s n N o o O p r i t I h u T l c o S a e s E d U f e o l Q e i a E u t l H v a e d t T E . n h e p o e T T i t A E d C L I K h e v i o D O T r P N O I B 1 Small mass M=3kg is suspended from the inelastic non-stretchable string of length L=8m. At time t =0 this simple pendulum makes an angle θ=50deg with the vertical. a) Draw free body diagram when the pendulum is at the highest and when it is at the lowest position write Newton’s Equations describing lowest position. b) Find the general expression for T (L, θ) tension in the rope at the lowest point c) Calculate T in Newtons 2 A 10.0-kg block is released from point A in Figure P7.51. The track is frictionless except for the portion between points B and C, which has a length of 6.00 m. The block travels down the track, hits a string of force constant 2 250 N/m, and compresses the spring 0.300 m from its equilibrium position before coming to rest momentarily. Determine the coefficient of kinetic friction between the block and the rough surface between B and C. 3 A rocket has a net acceleration of 2.4m/s2 directed at 60degrees above horizontal. What is the apparent weight vector of the 70-kg pilot? 4. A 4.00-kg object is attached to a vertical rod by two strings as shown in Figure P5.20. The object rotates in a horizontal circle at constant speed 6.00 m/s. Find the tension in (a) the upper string and (b) the lower string. 5. A 30kg disk of radius 1m rotates about a vertical, frictionless axle with angular speed ωi=30rpm. A second disk of mass 10kg and radius 0.5m initially not rotating, drops onto the first disk. Because of friction between the surfaces, the two eventually reach the same angular speed ωf. (a) Calculate ωf. (b) Show that the kinetic energy of the system decreases in this interaction and calculate the ratio of the final to the initial rotational energy. 6. A uniform sign of weight Fg and width 2L hangs from a light, horizontal beam hinged at the wall and supported by a cable a) Determine (a) the tension in the cable and (b) the components of the reaction force exerted by the wall on the beam, in terms of Fg, d, L, and θ. ...
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## This note was uploaded on 01/25/2011 for the course SCIENCE CHM2120 taught by Professor Tonydurst during the Spring '08 term at University of Ottawa.

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