Multiple choice AS 2019.w11

For which quantity is the magnitude a reasonable estimate?

• frequency of a radio wave 500 pHz

• mass of an atom 500µg

• the Young modulus of a metal 500 kPa

• wavelength of green light 500 nm

The speed of a wave in deep water depends on its wavelength L and the acceleration of free fall g. What is a possible equation for the speed v of the wave?

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The diagram shows two vectors X and Y, drawn to scale. If X = Y – Z, which diagram best represents the vector Z?

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A student intends to measure accurately the diameter of a wire (known to be approximately 1 mm) and the internal diameter of a pipe (known to be approximately 2 cm). What are the most appropriate instruments for the student to use to make these measurements?

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The power P dissipated in a resistor of resistance R is calculated using the expression   $P=\frac{v^2}{R}$  where V is the potential difference (p.d.) across the resistor. The percentage uncertainty in V is 5% and in R is 2%. What is the percentage uncertainty in P? 

• 3% 

• 7% 

• 8% 

• 12% 

The velocity-time graph for an object of mass 2.5 kg is shown. What is the resultant force acting on the object?

• 0.60N

• 0.80N

• 1.5N

• 2.0N

Which statement follows directly from Newton’s first law?

• A body remains at constant velocity unless acted upon by a resultant force.

• A satellite in circular motion about the Earth has a constant velocity.

• A water drop leaving a spinning umbrella travels at a constant velocity.

• The force acting on an object is equal to its change in momentum.

A resultant force causes an object to accelerate. What is equal to the resultant force?

• the acceleration of the object per unit mass

• the change in kinetic energy of the object per unit time

• the change in momentum of the object per unit time

• the change in velocity of the object per unit time

A skydiver falls from an aircraft that is moving horizontally. The vertical component of the velocity of the skydiver is v. The vertical component of the acceleration of the skydiver is a. Which row describes v and a during the first few seconds after the skydiver leaves the aircraft?

• v and a are constant

• v is constant so a is decreasing

• v is increasing so a is constant

• v is increasing so a is decreasing

Two gliders are travelling towards each other on a horizontal air track. Glider P has mass 0.30 kg and is moving with a constant speed of 1.2m/s. Glider Q has mass 0.60 kg and is moving with a constant speed of 1.8 m/s. The gliders have a perfectly elastic collision. What are the speeds of the two gliders after the collision?

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