* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download King Abdulaziz University
Specific impulse wikipedia , lookup
Center of mass wikipedia , lookup
Derivations of the Lorentz transformations wikipedia , lookup
Relativistic mechanics wikipedia , lookup
Coriolis force wikipedia , lookup
Brownian motion wikipedia , lookup
Mass versus weight wikipedia , lookup
Fictitious force wikipedia , lookup
Velocity-addition formula wikipedia , lookup
Jerk (physics) wikipedia , lookup
Modified Newtonian dynamics wikipedia , lookup
Variable speed of light wikipedia , lookup
Matter wave wikipedia , lookup
Faster-than-light wikipedia , lookup
Classical mechanics wikipedia , lookup
Seismometer wikipedia , lookup
Rigid body dynamics wikipedia , lookup
Equations of motion wikipedia , lookup
Hunting oscillation wikipedia , lookup
Newton's theorem of revolving orbits wikipedia , lookup
Classical central-force problem wikipedia , lookup
King Abdul-Aziz University Faculty of Science at Khulais Physics Department Phys 110 Questions bank - chs.(4 - 7). * CHOSE THE CORRECT ANSWER: Ch. 4 Q.1. A particle goes from (x = −2m, y = 3m) to (x = 3m, y = −1m) , Its displacement is: A) (1 m)ˆi + (2 m)ˆj C) −(5 m)ˆi + (4 m)ˆj B) (5 m)ˆi − (4 m)ˆj D) −(1 m)ˆi − (2 m)ˆj ____________________________________________________ Q.2 which of the following is a scalar quantity? A) Speed B) Velocity C) Displacement D) Acceleration _____________________________________________________ - At this figure show the Projectile motion Q.3 From this figure determined the maximum height (h): vo sin 2 A) h= 2l 2 vo sin 2 B) h= 2g 2 2 v l C) h= o 2g D) h= cos 2g ____________________________________________________ Q.4 the maximum Range (R): 2 A) R vo g B) R sin 2 2 C) R vo sin 2 g 2 D) R vo cos g ____________________________________________________ Q.5 From this figure determined the total time of flight (T): A) T 2vo g B) T sin g C) T 2 vo hl D) T 2vo sin g ____________________________________________________ Q.6 – When a projectile fired from the origin with Initial speed V at different . The maximum range occurs when ……………………. A) = 45 B) =90o C) =180o D) =360o ____________________________________________________ Q.7 – When a projectile fired from the origin with Initial speed V at different . The maximum height occurs when ……………………. A) = 45° B) =90o C) =180o D) =360o ____________________________________________________ Q.8– When a projectile fired from the origin with Initial speed V at different . The maximum value for the time of maximum range value occurs when ……………………. A) = 45° B) =180o C) =360o D) =90o ____________________________________________________ Q.9- In a projected body, the component of its velocity in x –direction is……….. A) Vo B) remains constant with time C) Accelerated D) changes with the angle ____________________________________________________ Q.10- In a projected body, the component of its velocity in y –direction is zero at……………………………. A) V= Vo B) remains constant with time C) The bottom of the path D) The peak of the path __________________________________________________ Q.11- The coordinates of a particle moving in the xy-plane are given by: x =1+2t2 y =2t+1t3 The particle's velocity and it's direction at time t=2 sec A) 16.1 m/s , 60.3° B) 22 m/s , 50.3° C) 32 m/s , 45° D) 43 m/s , 10.5° ____________________________________________________ Q.12- A large cannon is fired from ground level at an angle of 30 above the horizontal. The muzzle speed is 980 m/s. The horizontal distance the projectile will travel before striking the ground, assume g = 9.8 m/s2 A) 8.5 km B) 45 km C) 33 km D) 85 km ____________________________________________________ Q.13- A car rounds a 20 m radius curve at 10 m/s. The magnitude of its acceleration is: A) 0 m/s2 B) 0.2 m/s2 C) 5 m/s2 D) 40 m/s2 _____________________________________________________ Q.14- A boat heading north crosses a river with speed of 10 km/h relative to the water. The river has speed of 5.00 km/h to as relative to the Earth. Determine velocity of the boat relative to an observer standing on bank. A) 25 m/s, 20,8° B) 12 m/s, 46,6° C) 10 m/s, 50,5° D) 125 m/s, 26,6° _____________________________________________________ Ch. 5 Q. 15- The weight is A) is the force exerted on the body by the earth C) W = m. a B) W = m. g D) A and B ____________________________________________________ Q.16- The weight measuring unit is A) Newton b) dyne Q. 17- 1 Newton = A) 1 Kg. m. S-2 C) Kg. m. S-2 B) 105 dyne D) All of these c) A and B D) 5 dyne _________________________________________________ Q.18- The …………. is defined as the force when acting on a mass of 1 Kg produced an acceleration of 1 m.s-2 A) Newton B) meter C) dyne d) Velocity _________________________________________________ Q.19- The …………. is defined as the force when acting on a mass of 1 g produced an acceleration of 1 cm.s-2 A) Newton B) meter C) dyne d) Velocity Q.20- 1 dyne = A) 105.5 Newton B) 105 Newton C)10-4 cm D) 10-5 Newton ___________________________________________________ Q.21 - First Newton’s law of motion states that: A) F = ma B) Everybody continues in its state of rest or motion, unless it's forced to change that state by force. C) F12 = - F21 D) None of the above ____________________________________________________ Q. 22 – The friction coefficients µs and µk are depending on: A) Nature of the velocity B) Nature of the surfaces C) Nature of the Air D) Nature of measurements. ____________________________________________________ Q.23 This law “For every action there is a reaction equal in magnitude and opposite in direction” is: A) Newton’s second law B)Hook's law C) Newton’s first law D) Newton’s third law _____________________________________________________ Q.24 A traffic light weighing 150 N hangs from a cable tied to two other cables fastened to a support. The upper cables make angles of 37.0° and 53.0° with the horizontal. Find the tension in the three cables. A) T1 = 75.1 N, T2 = 99.9 N, T3 = 125 N B) T1 = 100 N, T2 =20 N, T3 = 150 N C) T1 = 75.1 N, T2 =200 N, T3 = 30 N D) T1 = 90.11 N, T2 =119.843 N, T3 = 150 N Q.25 A traffic light weighing 125 N hangs from a cable tied to two other cables fastened to a support. The upper cables make angles of 37.0° and 53.0° with the horizontal. Find the tension in the three cables. A) T1 = 75.1 N, T2 = 99.9 N, T3 = 125 N B) T1 = 100 N, T2 =20 N, T3 = 150 N C) T1 = 75.1 N, T2 =200 N, T3 = 30 N D) T1 = 90.11 N, T2 =119.843 N, T3 = 150 N ___________________________ Q.26 Force of static friction equal -------- . A) fs ≤ µs n B) fs ≥ 3µs n C) fs ≥ µs n2 D) fs ≥ 2µs n where µs: the coefficient of static friction and n magnitude of the normal force. _____________________________________________________ Q.27. The force of Kinetic friction equal …………………….. A) fk ≤ µk n B) fk ≥ 3µk n C) fk= µk n2 D) fk= µk n _____________________________________________________ Q.28 A hockey puck on a frozen pond is given an initial speed of 20.0 m/s. If the puck always remains on the ice and slides 115 m before coming to rest, determine the coefficient of kinetic friction between the puck and ice. A) 2.44 B) 0.177 C) 3.4 D) 5.66 _____________________________________________________ Q.29 Suppose a block is placed on a rough surface inclined relative to the horizontal, as shown in this Figure. The incline angle is increased until the block starts to move. Let us show that by measuring the critical angle θc at which this slipping just occurs, determine the coefficient of kinetic friction ( µk)? A) µk = cos θc B) µk = sin θc C) µk = tan θc D) µk = cos 2θc _____________________________________________________ Ch. 6 Q. 30 - The Periodic time is: A) 1/f B) The time required to complete one circle C) 2r v D) All is correct ____________________________________________________ Q.31- The frequency f is A) The reciprocal of the Periodic time B) The total number of complete cycles divided by the time C) The time required to complete one circle D) A and B ________________________________________________ Q.32 - The velocity in circular motion is variable because is: A) Acceleration is zero B) Time is constant C) Speed changes direction D) displacement = distance _________________________________________________ Q.33 - A particle moving in a circular motion its acceleration directed: A) The same direction of r B) Outwards the center of the circle. C) No direction D) Towards the center of the circle. ____________________________________________________ Q.34- If a particle moving with uniform speed v in a circular path of radius r experiences an acceleration ar that has a magnitude A) ar= v2*r B) ar= v2/3r C) ar= 2v2/r D) ar= v2/r Q.35- in comparison between the linear and curricular motion one can note that …… A) ar = r × a b) ar = r2×a c) ar = r2×a d) ar = a ____________________________________________________ Q.36- In comparison between the linear and curricular motion one can note that …… A) v = r × 2 b) v = r × c) v = r2×a d) v = ____________________________________________________ Q.37- A ball of mass 1 kg is attached to the end of a cord 2 m long. The ball is whirled in a horizontal circle as was shown this Figure. If the cord can withstand a maximum tension of 100 N, what is the maximum speed the ball can attain before the cord breaks? Assume that the string remains horizontal during the motion. A) 14.14 m/s B) 12.51 m/s C) 10.41 m/s D) 44.21 m/s Q.38 At Q.37 Calculate the tension in the cord if the speed of the ball is 5.00 m/s. A) 10.35 N B) 8.33 N. C) 12.50 N D) 22.56 N _____________________________________________________ Q.39 A small object of mass m is suspended from a string of length L. The object revolves with constant speed v in a horizontal circle of radius r, as shown in Figure (Because the string sweeps out the surface of a cone, the system is known as a conical pendulum.) Find an expression for v. A) B) C) D) V = √ Lg V = √ Lg sinθ tanθ V = √ Lg sinθ V = √ L sinθ tanθ ____________________________________________________ Q. 40- in Q. 39 calculate the velocity v if L = 50 m and θ= 50 degree (g = 9.8 m / s2). A)21.15 B) 21.15 m/s2 c) 21.15 m/s d) 21.15 m2 ____________________________________________________ Q.41 A 1500-kg car moving on a flat, horizontal road negotiates a curve, as illustrated in this Figure. If the radius of the curve is 35.0 m and the coefficient of static friction between the tires and dry pavement is 0.500, find the maximum speed the car can have and still make the turn successfully A) B) C) D) 43.1 m/s 33.4 m/s 13.1 m/s 3.1 m/s ____________________________________________________ Q. 42 A civil engineer wishes to design a curved exit ramp for a highway in such a way that a car will not have to rely on friction to round the curve without skidding. In other words, a car moving at the designated speed can negotiate the curve even when the road is covered with ice. Such a ramp is usually banked; this means the roadway is tilted toward the inside of the curve. Suppose the designated speed for the ramp is to be 13.4 m/s (30.0 mi/h) and the radius of the curve is 50.0 m. At what angle should the curve be banked? A) θ = 40.4 o B) θ = 20.1 o C) θ = 30.5 o D) θ = 50.1 o ____________________________________________________ Q. 43 A satellite moving in a circular orbit around the Earth. The gravitational force between spherical objects and small objects that can be modeled as particles having masses m1 and m2 and separated by a distance r is attractive and has a magnitude Fg=G (m1m2)/r2 where G = 6.673 *1011 Nm2/kg2. Consider a satellite of mass m moving in a circular orbit around the Earth at a constant speed v and at an altitude h above the Earth’s surface, as illustrated in this Figure. Determine the speed of the satellite in terms of G, h, RE (the radius of the Earth), and ME (the mass of the Earth). A) V = √( ME / RE + h) C) V = √(G / RE + h) B) V = √(G ME / RE + h) D) V = √(G ME / RE ) _____________________________________________________ Q.44 From Q. 43 if a satellite is in a circular orbit around the Earth at an altitude of 1000 km. The radius of the Earth is equal to 6.37 ×106 m, and its mass is 5.98 ×1024 kg. Find the speed of the satellite? A) v = 10 *103 m/s B) v = 9 *105 m/s C) v = 7.36 *1033 m/s D) v = 7.36 *103 m/s ____________________________________________________ Q.45- The gravitational force between two particles having masses m1 and m2 and separated by a distance r is A) Fg = G(m1.m2/ r2) B) Fg = G (q1.m2/r2) C) Fg = G(m1.m2/r) D) Fg = G(2m1.m2/2r) `____________________________________________________ _ Ch. 7 Q. 46- The work done on an object is directly proportional to: A) Circular motion B) Force C) Polar Coordinates D) Time ____________________________________________________ Q.47- ------ is the time rate of doing work. A) Power B) Newton's law C) Work D) Force ____________________________________________________ Q.48- The SI unit of power is joules per second (J/s), also called the ------ . A) Gram B) Meter C) Watt D) Joule ____________________________________________________ Q.49- A force acting on a particle varies with x, as shown in this Figure. Calculate the work done by the force as the particle moves from x = 0 to x = 6.0 m? A) 7 J B) 23J C) 18 J D) 25 J ____________________________________________________ Q.50- From Work Done by a Spring this relation Fs = - k x is called ----------. A) Hooke’s law B) Joule C) Newton's law D) Power Q.51- Potential energy is energy associated with the motion of a body equal ------------ . B) U = 2 m v3 A) U = 3/4 m v C) U = m g h D) U = 1/2 mv2 _____________________________________________________ Q.52- An elevator car has a mass of 1 000 kg and is carrying passengers having a combined mass of 800 kg. A constant frictional force of 4 000 N retards its motion upward, as shown in this Figure. What power must the motor deliver at the instant its speed is v if it is designed to provide an upward acceleration of 1.00 m/s2? A) (10 x 104v3 ) W C) (4.33 x 105 v ) W B) (2.34 x 104v ) W D) (2.34 x 104v ) W _____________________________________________________ Q.53- The power P = A) F. V B)W/dt C) A, b D) w2/dt _____________________________________________________ Q. 54. The work W = A) F.x B) Δ K C) F. x2 D) A, B _____________________________________________________ Q. 55 – 1 Watt = A) 1J/s B) 1 Kg. m2/s3 C) 1 N. m / S D) All of these ____________________________________________________ Q. 56The time of flight has two values because: A) Second order equation B) y = 0 at two positions C) At beginning and at arriving ground D) All of the above. ____________________________________________________ Q. 57 Acceleration due to gravity on the surface of the moon gm is 1.7 m/s2 and moon radius is 1.74X106m, calculate the mass of the moon (G=6.67X1011 Nm2/Kg2) A) 1000 kg B) 6.0X1022 kg.N C) 7.7X1022kg D) 2.2X1030kg m :ترجمة بعض الكلمات الواردة في األسئلة Potential energy Satellite Civil engineer particle Acceleration radius whirled uniform speed طاقة الوضع قمر صناعي مهندس مدني جسيم )عجلة (تسارع نصف قطر يدور Boat Racing direction initial height maximum coefficients of friction سرعة منتظمةsurface قارب سباق اتجاه ابتدائي ارتفاع أقصى معامل االحتكاك string Vertically Horizontal Magnitude Upward dropped design سطحSpring خيط عمودي أفقي قيمة عددية إلى أعلى سقط يصمم زنبرك