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Student Last Name________________First Name_______________ Initial Test, Fall 2013, Hostos CC
- How far will a brick starting from rest fall freely in 2 seconds? Use g=10 m/s2
a) 5 m, b) 20 m, c) 45 m, d) 80 m, e) No solution
- A spring scale reads 20 newtons as it pulls a 4-kilogram mass across a table. What is the magnitude of the force exerted by the mass on the spring scale?
a) 80 N, b) 0.02kN, c) 5 N, d) 5 N/kg, e) No solution
- A 4-kilogram mass is moving across a horizontal surface at 10 meters per second. What is the magnitude of the net force required to bring the mass to a stop in 8 seconds?
a) 3.2 N, b) 20 N, c) 320 N, d) 5 N, e) No solution
- A student used 234 milliliters of water in his science experiment. How many liters of water did the student use?
a) 23400 liters, b) 2340 liters, c) 2.34 liters, d)23.4 liters, e) No solution
- A student is building a rectangular prism out of wooden cubes (see fig.1). What is the volume of student's rectangular prism? The volume of each wooden cube is 10 cm3.
a) 1080cm3, b) 370 cm3, c) 130cm3, d) 720 cm3, e) No solution
- The friction force of a solid body on a inclined surface is directly proportional to the
a) velocity, b)net force, c) acceleration, d)incline angle, e) No solution.
- A student leaves a classroom and walks 30 meters north to a drinking fountain. Then she turns and walks 40 meters south to a computer classroom. What is the student’s total displacement from the first classroom to the
computer classroom?
a) 70 m north, b) 50 m north-south, c) 10 m south, d) 10 m north, e) No solution
- In the equation KE=mv2/2 symbol v means
a)volume, b)velocity, c) voltage, d) voice, e) No solution
- One car travels 40 meters due east in 5 seconds, and a second car travels 64 meters due west in 8 seconds. During their periods of travel, the cars definitely had the same
a) average velocity, b) average speed, c) change in momentum, d) total displacement, e) No solution
- A rock with a volume of 0.2m3 is fully submerged in water having a density of 1000kg/m3. What is the buoyant force acting on the rock?
a) 2kN, b) 5kN, c) 200N, d) 1kN, e) No solution
- In the ρ=m/V symbol V means
a) velocity, b) volume, c) vector, d) vertical, e) No solution
- What is the acceleration of a 20 kg truck if a force of 60 N is used to make it start moving forward?
a) 1/3 m/s2, b) 3 m/s2, c) 2 m/s, d) 1200 m/s2, e) No solution
- In the p=m·v symbol p means
a) pressure, b) energy, c) radius, d) density, e) No solution
- A ball thrown vertically upward reaches a maximum height of 20 meters above the surface of Earth. At its maximum height, the acceleration of the ball is
a) 20 m/s, b) 9.8 m/s2, c) 0 m/s, d) 10 m/s, e) No solution
- In the Fg=G m1 m2/r2 symbol r means
a) distance, b) reaction, c) resistance, d) rate, e) No solution
- Correct formula for the spring's potential energy is
a) kx/2, b) kx2, c) k2x/2, d) x2k/2, e) No
solution
- What is the angular acceleration measured in?
a) m/s2, b) 1/s2, c) kg m/s2, d) revolutions, e) No solution
- What is speed measured in?
a) m s, b) m2/s, c) m/s2, d) s/m, e) No solution
- What is correct relationship?
a) a=(vf-vi)/t2, b) vx=(xf-
xi) / t, c) a=(vi-vf)/t, d) v=at2/2, e) No
solution
- If the net force 5N is acting 10 s on a free body. What is the resulting change of the body's impulse?
a) 2 s/N, b) 0.5N/s, c) 50 kg m/s2, d) 50 kg m/s, e) No solution.
- If the speed of a car is doubled, the kinetic energy of the car is
a) quadrupled, b) doubled, c) quartered, d) halved, e) No solution
- What is the net torque acting on the square body (see fig. 2), relative to the axis passing through the left bottom corner? All forces and points, where the forces are applied, are shown on the picture.
a) 2N·m, b) 20N·m, c)11N·m, d) 9N·m, e) No solution.
- What is angular acceleration of the body (see fig. 2) if the angular inertia of this body relative to the shown axis of rotation is 10 kg m2?
a) 0.2 s-2, b) 2 s -2, c) 0.11 s-2, d) 0.9 s-2, e) No solution.
- An upward force of 40 N is applied via a string to lift a ball with a mass of 2 kg. What is the acceleration of the ball? Use g=10 m/s2.
a) 10 m/s2 b) 20m/s2 c) 10 d) 20 e) No solution.
- A student does 60 joules of work pushing a 3-kilogram box up the full length of a ramp that is 5 meters long. What is the magnitude of the force applied to the box to do this work?
a) 20 N, b) 12 N, c) 15 N, d) 4 N, e) No solution
- What is the weight of 40 m3 of water?
a) 400 kN, b) 0.4 kN, c) 4 kN, d) 40·103 kg, e) No solution
- A 50 kg woman in an elevator is accelerating upward at a rate of 1 m/s2. What is is the normal force pushing on the woman's feet?
a) 50 N b) 500 N c) 550 N d) 450 N e) No solution.
- What is acceleration measured in?
a) m/s2, b)m/s, c) accelerators , d) Hertz, e) No solution
- Two masses are attracted by a gravitational force of 9 N. What is the force attraction, if the distance between the masses is doubled?
a) 27 N b) 3 N c) 1 N d) 81 N e) No solution.
- What is the speed of a 1.0 × 103-kilogram car that has a momentum of 2.0 × 104 kilogram•meters per second east?
a) 2 m/s, b) 20 m/s, c) 200 m/s, d) 2.0 × 107 m/s, e) No solution
- A box with a mass of 2 kg is lifted without acceleration through a height of 6 m. What is the increase in potential energy of the box?
a) 120 N b) 1/3 kg/m c) 12 kg·m d) 3 m/kg e) No solution
- The percent of difference for masses 10 kg and 30 kg is
a) 20kg, b) 1, c) 100%, d) 200% e) No solution
- A force of 60 N pushes down on the movable piston of a closed cylinder containing a gas. The piston area is 0.20 m2. What pressure does this produce in the gas?
a) 12 Pa, b) 120 Pa, c) 0.30 kPa, d) 0.20 kPa, e) No solution
- A plane increases its speed uniformly from 10 meters per second to 20 meters per second over a distance of 15 meters. The magnitude of plane's acceleration is
a) 2/3 s-1, b) 2 m/s2, c) 0.67 m/s2, d) 10 m/s2, e) No solution
- An unit Pa is equivalent to
a)kg m /s2, b) N/m3, c)m2N, d) N/m2,
e) No solution
- An unit N is equivalent to
a) kg m/s2, b) m/s2, c) kg m s2, d) kg/m s2,
e) No solution
- What is pressure measured in?
a)Newtons, b) Passions, c) kg m/s2, d) Pascals, e) No solution
- A boat weighing 9.0 × 102 newtons requires a horizontal force of 6.0 × 102 newtons to move it across the water at 1.5 × 101 meters per second. The boat’s engine must
provide energy at the rate of
a) 2.5 × 10-2 J, b) 7.5 × 103 J, c) 4.0 × 101 W, d) 9.0 × 103 W, e) No solution
- A ball thrown vertically upward reaches a maximum height of 20 meters above the surface of Earth. At its maximum height, the speed of the ball is
a) 20 m/s, b) 9.8 m/s2, c) 0 m/s, d) 10 m/s, e) No solution
- A ball traveling with an initial momentum of 1 kg m/s bounces off a wall and comes back in the opposite direction with a momentum of -1 kg m/s. What is impulse is required to produce this change?
a) 0 N·s b) 2 kg·m/s c) -2 N·s d) 0 kg·m/s e) No solution.
- A truck with a mass of 1000 kg traveling with a speed of 3 m/s collides at right angles with a car with a mass of 1000kg traveling with a speed of 4 m/s. The two vehicles stick together after the collision. What is the
speed of the two vehicles after they collide?
a) 3.5 m/s b) 5 m/s c) 2.5 m/s d) 7 m/s e) No solution.
- A ball is hit with a force of 16 N which causes it to accelerate at 10 m/s2 just after it is struck. What is the mass of the ball?
a) -1.6 kg b) 160 kg c) 1/16 kg d) 1.6 kg e) No solution.
- If a velocity V has the x-component Vx = 2 m/s, and the y-component Vy = 1.5 m/s, what is the velocity magnitude?
a) 3.5 m/s, b) 0.5 m/s, c) 2.5, d) 250 cm/s, e) No solution
- A 2000kg car moving 6 m/s collides with a 2000 kg car at rest. If cars coupled together, what is their speed after the collision?
a) 0 m/s, b) 2 m/s, c) 3 m/s, d) 4 m/s, e) No solution
- If the initial horizontal component of the velocity of a free falling body is 30m/s and the initial vertical component is 10 m/s upward. What is the speed after 2 s?
a) 20 m/s, b)30 m/s, c) 40 m/s, d) 50 m/s, e) No solution.
- What is momentum measured in?
a) N/s, b) Pascals, c) kg m/s, d) kg, e) No solution
- A car with a mass of 2000kg is moving around a curve with a radius of 20 m at a constant speed of 2m/s. What is the magnitude of the force required to produce the centripetal acceleration of the car?
a) 4 kN b) 0.4 kN c) 10m/s2 d) 2000 N e) No solution.
- If the real speed equals to 10 m/s then the measurement of 8 m/s has the percent of error:
a) 50%, b) 40%, c) 20%, d) 10%, e) No solution
- One watt is equivalent to one a) N•m, b) J•s, c) N/m, d) J/s, e) No solution
- Correct answers for questions “how far ...?” could include:
a) N, b) kg, c) m2, d) m, e) No solution
MidtermExam2012Fall_BMCC_General_Physics_V2.doc = Initial_Test_2013_Spring_Hostos_General_Physics_2.doc
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С какой частотой проносятся вагоны проходящего мимо наблюдателя поезда, если наблюдатель неподвижно стоит на перроне. В искомой формуле использовать как параметры: скорость поезда, длина состава, количество вагонов в составе.
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