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Write A if the statement is true, but if false, write B and then change the word(s) in the ...
Write A if the statement is true, but if false, write B and then change the word(s) in the parentheses to make it true.The amount of work done on a body equals the change in (kinetic energy) of the body
A car of mass 212kg descends a hill of slope 1 in 5. Calculate using an energy method, the average b
A car of mass 212kg descends a hill of slope 1 in 5. Calculate using an energy method, the average braking force required to bring the car to rest from 82km/h in 50m. The frictional to motion is 350N.
The total weight of an elevator and its contents is 104 N. The tension in the elevator's cable is
The total weight of an elevator and its contents is 104 N. The tension in the elevator's cable is 2:5 £ 103 N. This results in downward acceleration of 7.35 m/s2. An occupant whose weight is 103 N stands on a scale. What is the scale's reading for the occupant's apparent weight?
A scorpion's crawl consists of 3 straightline segments. Segment A is a displacement of 15 cm in the
A scorpion's crawl consists of 3 straightline segments. Segment A is a displacement of 15 cm in the direction 30 degrees north of east. Segment B is a displacement of 20 cm in the direction 45 degrees west of north. Segment C is a displacement of length 10 cm directly east. What is the angle (in degrees) between the net displacement vector of the crawl and the north direction?
A projectile is shot at an angle of 20 degrees above the horizontal with an initial speed vo and
A projectile is shot at an angle of 20 degrees above the horizontal with an initial speed vo and impacts a distance of 100 m away at the same height above the ground from which it is shot. The same gun is now moved to planet Magrathea where gravity is 2 times the gravity on earth and the projectile is shot at the same angle, but with 2vo. On Magrathea the range of the projectil
City A is 50 km north of city B. A plane °ies with constant speed of 60 m/s relative to the air.
City A is 50 km north of city B. A plane flies with constant speed of 60 m/s relative to the air. The wind blows toward the east with speed 30 m/s. The pilot aims the plane so that it travels along a straight lines from B to A. How much time is required for the plane to travel from B to A?
(1) 960 s (2) 480 s (3) 1150 s (4) 1350 s (5) 1620 s
A train travels with constant horizontal velocity of 10m/s relative to the ground. A passenger on
A train travels with constant horizontal velocity of 10m/s relative to the ground. A passenger on the train throws a ball straight up with initial speed of 10 m/s, as measured in the frame of the train. What is the initial speed (in m/s) of the ball relative to the ground?
A bullet exits a rifle with speed 1500 ft/s. The bullet is shot horizontally from a height of 2 m.
A bullet exits a rifle with speed 1500 ft/s. The bullet is shot horizontally from a height of 2 m. How far does the bullet travel horizontally before it hits the ground? (1 ft = 0.3 m.)
Ball A is dropped with zero initial velocity from the top of a building of height 40 m. At the same
Ball A is dropped with zero initial velocity from the top of a building of height 40 m. At the same instant ball B is thrown straight up from the ground. The balls collide after 2 seconds. What was the initial speed of ball B in m/s?
Use Poiseuille’s law to find the pressure gradient (delta P/L) in a 5-cm diameter fire hose
Use Poiseuille’s law to find the pressure gradient (delta P/L) in a 5-cm diameter fire hose delivering water at 2.3x10-2 m3/s. The viscosity of water is 1.0 x 10-3 Pa-s.
(1) 150 Pa/m (2) 6.7 x 10-3 Pa/m (3) 12 Pa/m (4) 9.4 x 10-2 Pa/m (5) None of these.
As shown in the diagram, a pipe with constant diameter is bent into a large S shape. The top of the
As shown in the diagram, a pipe with constant diameter is bent into a large S shape. The top of the pipe is 6 m above the bottom of the pipe and it is open to the atmosphere. The pressure at the upper end would be one atmosphere. What is the pressure at the lower end of the pipe?
(1) 1.6 £ 105 Pa (2) 1.0 £ 105 Pa (3) 1.3 £ 105 Pa (4) Cannot be determined wi
You swim in a lake to a depth of 2 m. At what depth will you experience twice that pressure.
You swim in a lake to a depth of 2 m. At what depth will you experience twice that pressure. Hint: Do not forget to include the effect of the atmosphere.
(1) 14 m (2) 4 m (3) 10 m (4) 8 m (5) None of these.
A figure skater is in a position where he spins once in 1.8 seconds. If he pulls his arms and legs
A figure skater is in a position where he spins once in 1.8 seconds. If he pulls his arms and legs in so that his rotational inertia is reduced by one half, how long does it take for him to spin one time?
(1) 0.90 s (2) 3.6 s (3) 1.8 s (4) 2.7 s (5) None of these.
100-kg thin circular hoop has radius 2 m. Its angular velocity decreases from 20 rad/s to zero in
100-kg thin circular hoop has radius 2 m. Its angular velocity decreases from 20 rad/s to zero in 200 s due to friction. What is the frictional torque acting on the hoop?
A 3-kg uniform disk has a radius of 0.6 m. An additional 1-kg mass is glued to the edge of the disk.
A 3-kg uniform disk has a radius of 0.6 m. An additional 1-kg mass is glued to the edge of the disk. What is the rotational inertia of the combination if the disk/mass combination rotates about the center of the disk?
A uniform 2-m long rod has a 3 kg mass. Another mass is attached to the left end of the rod.
A uniform 2-m long rod has a 3 kg mass. Another mass is attached to the left end of the rod. The center of mass of the system is now 25 cm to the left of the center of the rod. What is the value of the attached mass?
(1) 1 kg (2) 2 kg (3) 3 kg (4) 4 kg (5) None of these.
While driving down Museum Road, you see Mr. Parks crossing the road. Seeing your opportunity, yo
While driving down Museum Road, you see Mr. Parks crossing the road. Seeing your opportunity, you accelerate your car (1200 kg) from 9.0 m/s (about 20 miles/hour) to 15 m/s. Unfortunately, you do not see another car (mass of 1500 kg) pull out in front of you at 10 m/s. The cars are traveling perpendicular when they collide and they stick together after the collision. What is the spe
A 2-kg mass sliding at 5 m/s collides elastically with a 3-kg mass sliding at 2 m/s as shown in
A 2-kg mass sliding at 5 m/s collides elastically with a 3-kg mass sliding at 2 m/s as shown in the diagram. The collision is in a straight line, so it can be considered to me a one-dimensional collision. What is the speed of the 3-kg mass after the collision?
A 15-kg rocket is traveling horizontally at 40 m/s. The rocket explodes, breaking into two pieces.
A 15-kg rocket is traveling horizontally at 40 m/s. The rocket explodes, breaking into two pieces. The 5-kg piece is traveling at 60 m/s in the same direction as the original intact rocket. What is the velocity of the other piece?
(1) 30 m/s in the same direction as the intact rocket (2) 30 m/s in the opposite direction as the intact rocket (3) 40 m/s in the sam
In Super Smash Brothers, Peach uses her vegetable attack to hold off Bowser. She throws the turnip
In Super Smash Brothers, Peach uses her vegetable attack to hold off Bowser. She throws the turnip at Bowser and it bounces back. Assume the turnip has a mass of 1.5 kg. When it hits Bowser, it is traveling at 6 m/s and when it bounces back it is traveling at 2 m/s. If the turnip is in contact with Bowser for 0.2 s, what is the average force exerted by the turnip on Bowser?
A car with mass of 1000 kg accelerates from 10 m/s to 40 m/s in 10 s. Ignore air resistance.
A car with mass of 1000 kg accelerates from 10 m/s to 40 m/s in 10 s. Ignore air resistance. The engine has 22% efficiency, which means that 22% of the energy released by the burning gasoline is converted into mechanical energy. What is the average mechanical power output of the engine?
(1) 7.5 x 104 W (2) 7.5 x 105 W (3) 8.0 x 104 W (4) 1
A 45-kg boy drags his 15-kg sled to the top of a 15-m tall hill. He rides down the hill (with no fr
A 45-kg boy drags his 15-kg sled to the top of a 15-m tall hill. He rides down the hill (with no friction or air resistance) and then applies brakes over a level section of ground, stopping over a distance of 44 m. What is the average braking force exerted on the sled?
(1) 200 N (2) 150 N (3) 49 N (4) 590 N (5) None of these.
A roller coaster is traveling at 3 m/s when it is 60 m above the ground. What is the speed when the
A roller coaster is traveling at 3 m/s when it is 60 m above the ground. What is the speed when the roller coaster is 30 m above the ground? Assume that friction and air resistance can be ignored.
(1) 24 m/s (2) 6 m/s (3) 34 m/s (4) 12 m/s (5) Cannot be determined without knowing the mass of the roller coaster.
The block shown in the diagram slides at constant speed to the right. How much work is
The block shown in the diagram slides at constant speed to the right. How much work is done by kinetic friction after the block has traveled 6 m? F1 is 10 N and F2 is 15 N and it points at 37± above the horizontal.
Two long, straight, parallel conductors are 10 cm apart (see figure below). Conductor A has a current i_A=2.0 A flowing out of the page, and conductor B has a current i_B=3.0 A flowing in the opposite direction (into the page). [10 marks]
Calculate the intensity of the magnetic field at points P1, P2 and P3, where: (P_1 A) ̅=2cm, (P_2 A) ̅=4cm and (P_3 B
Consider the cross section of a current carrying wire as shown below. The current is carried by the 2 gray sections (0<r<a,and b<r<c). The current, i = 10 mA, is in the direction out of the page, half of it flowing in the inner wire and half in the outer shell. a) Assuming that the 3 sections have the same thickness, i.e. (0a) ̅=(ab) ̅=(bc) ̅=1cm, calcul
What is the relationship between Mercury's rotation about its axis (measured relative to the ...
What is the relationship between Mercury's rotation about its axis (measured relative to the distant stars) and its revolution around the Sun? (See Fig. 7-8 and the table accompanying Fig. 7-1, Comins and Kaufmann, Discovering the Universe, 7th Ed.) A) Mercury rotates once for every three revolutions around the Sun. B) Mercury rotates exactly once during each revoluti
A Van de Graff generator is charged with 2.82X 10^-6 C of positive charge
A small styrofoam ball has a 2.26 nC (2.26* 10^-9 C). Find the electric field strength at the surface 5.00cm (0.0500 m ) from the ball. SHOW YOUR work ( formula, substitution, and answer. ***(rounded correctly and with the appropriate unit))
( A Van de Graaff generator is charged with 2.82 * 10^-6 C of a positive charge.
#1) The idea of a field was needed for which reason? A) There was no way to calculate forces B) Forces were exerted without physical contact C) There was no way to know the direction of forces D) Forces affect only certain things.
#8) A weather satellite is launched from the ground and placed in orbit six times father away from the earths centre. The
An Air Force jet lands on a straight runway with a forward velocity of 75 m/s and the pilot applies ...
An Air Force jet lands on a straight runway with a forward velocity of 75 m/s and the pilot applies the brakes at a constitutional rate for 20 seconds until the jet slows to 10 m/s. How far down the runway did the jet go during this time?
A ball is thrown straight up from a 20.0 meter cliff at 17.5 m/s. the ball goes up and then all the ...
A ball is thrown straight up from a 20.0 meter cliff at 17.5 m/s. the ball goes up and then all the way to the ground below the cliff. Find: How high did the ball go and how fast was it going when it hit the ground? Up Down xi= &n
Use a graphing calculator and/or calculus techniques to show that the algebraic
Use a graphing calculator and/or calculus techniques to show that the algebraic formula of Bhaskara I approximates the Sine between 0 and 180 degrees with an error of no more than 1%. Find the values that are most in error
8. Brahmagupta asserts that if AB C D is a quadrilateral in- scribed in a cir
Determine where the object's kinetic energy and potential energy are the same.
An object on a spring slides on a horizontal frictionless surface with simple harmonic motion. Determine where the object's kinetic energy and potential energy are the same. Assume the maximum displacement of the object is A so it oscillates between +A and −A. x = ± ?
An object on a spring slides on a horizontal friction less surface with simple harmonic motion,
The image of our galaxy in radio emission from carbon monoxide maps the distribu
The image of our galaxy in radio emission from carbon monoxide maps the distribution of molecular clouds. Which of the following would give a similar picture of our galaxy?
The image of our galaxy in radio emission from carbon monoxide maps the distribution of molecular clouds. Which of the following would give
The image of our galaxy in radio emission from carbon monoxide maps the distribu
The image of our galaxy in radio emission from carbon monoxide maps the distribution of molecular clouds. Which of the following would give a similar picture of our galaxy?
