Physics HL practice questions

Object A of mass $m$ is lifted through a height $h$. Object B of mass $2m$ is lifted through a height $4h$. The gravitational field is constant over the height interval. What is the ratio:

$$\frac{\text{work done against gravity on object B}}{\text{work done against gravity on object A}}$$

A ball is thrown with velocity $u$ at an angle of $55°$ above the horizontal. Which of the following is the magnitude of the horizontal component of velocity?

A cyclist accelerates in a straight line. At one instant, when the cyclist is exerting a forward force of 40 N, the air resistance acting on the cyclist is 10 N.

What is the rate of change of momentum of the cyclist at this instant?[1]

Which of the following is the correct way of connecting an ammeter and of connecting a voltmeter in a circuit designed to measure the characteristics of a thermistor?

Which of the following is a fundamental SI unit?

A student of weight 600 N climbs a vertical ladder 6.0 m tall in a time of 8.0 s. What is the power developed by the student against gravity?

A fire engine with its siren sounding approaches and passes a stationary observer. The frequency of the sound emitted by the siren is $f_s$. The frequency of the sound measured by the observer is $f_o$. Which of the following describes the relationship between $f_o$ and $f_s$?

Which of the following is most likely to increase the rate of global warming?

The current in a resistor is measured as $2.00 \text{ A} \pm 0.02 \text{ A}$. Which of the following correctly identifies the absolute uncertainty and the percentage uncertainty in the current?

What is the best estimate for the diameter of a helium nucleus?[1]

The centres of two planets are separated by a distance $R$. The gravitational force between the two planets is $F$. What will be the force between the planets when their separation increases to $3R$?[1]

The specific latent heat is the energy required to change the phase of

The gravitational field strength at a point X in a gravitational field is defined as the force

Which of the following is necessary for an object to be in translational equilibrium?[1]

The ratio of the diameter of an atom to the diameter of its nucleus is: