2019年5月IB物理(SL)真题PDF下载-Paper1
1.A student wants to determine the angular speed ω of a rotating object. The period T is 0.50 s ±5 %. The angular speed ω is
ω=2π/t
What is the percentage uncertainty of ω?
A.0.2 %
B.2.5 %
C.5 %
D.10 %
2.A student models the relationship between the pressure p of a gas and its temperature T as p = x + yT.
The units of p are pascal and the units of T are kelvin. What are the fundamental SI units of x and y?
3.A sky diver is falling at terminal speed when she opens her parachute. What are the direction of her velocity vector and the direction of her acceleration vector before she reaches the new terminal speed?
4.A stone is thrown downwards from the edge of a cliff with a speed of 5.0 m s–1. It hits the ground 2.0 s later. What is the height of the cliff?
A.20 m
B.30 m
C.40 m
D.50 m
5.A ball is thrown upwards at an angle to the horizontal. Air resistance is negligible. Which statement about the motion of the ball is correct?
A.The acceleration of the ball changes during its flight.
B.The velocity of the ball changes during its flight.
C.The acceleration of the ball is zero at the highest point.
D.The velocity of the ball is zero at the highest point.
6.An object of mass m is sliding down a ramp at constant speed. During the motion it travels a distance x along the ramp and falls through a vertical distance h. The coefficient of dynamic friction between the ramp and the object is μ. What is the total energy transferred into thermal energy when the object travels distance x?
A.mgh
B.mgx
C.μmgh
D.μmgx
7.Two blocks of masses m and 2m are travelling directly towards each other. Both are moving at the same constant speed v. The blocks collide and stick together.What is the total momentum of the system before and after the collision?
8.The graph shows the variation with time of the resultant net force acting on an object. The object has a mass of 1 kg and is initially at rest.
What is the velocity of the object at a time of 200 ms?
A.8 m s–1
B.16 m s–1
C.8 km s–1
D.16 km s–1
9.A block is on the surface of a horizontal rotating disk. The block is at rest relative to the disk. The disk is rotating at constant angular velocity.
What is the correct arrow to represent the direction of the frictional force acting on the block at the instant shown?
10.Energy is transferred to water in a flask at a rate P. The water reaches boiling point and then P is increased. What are the changes to the temperature of the water and to the rate of vaporization of the water after the change?
2019年5月IB物理真题余下省略！
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