JC1Phy

Which estimate is reasonable?

• the mass of an orange is 1 x 10^-3 kg

• the volume of a tennis ball is 1 x 10^-1 m³

• the work done lifting an apple from waist height to head height is 1 x 10³ J

• the power of a light bulb in a house is 1 x 10¹ W

Which list of unit prefixes increases in magnitude from left to right?

• deci, centi, milli

• nano, milli, kilo

• kilo, centi, nano

• milli, nano, deci

Which two units are identical when expressed in terms of SI base units?

• N m and kg m³ s^–2

• N s and kg m s^–3

• J s and kg m² s^–1

• J C^-1 and kg m²A^-1s^-2

A value for the acceleration of free fall on Earth is given as (4.90 ± 0.02) m s^-2.

Which statement is correct?

• It is accurate and precise.

• It is accurate and not precise.

• It is not accurate and precise.

• It is not accurate and not precise.

• 7 %

• 11 %

• 17 %

• 34 %

A car travels clockwise along a horizontal circular road of radius 15 m, as shown.

The car takes a time of 4.0 s to move from position P to position Q.

What is the magnitude of the average velocity of the car for the journey from P to Q?

• 5.2 m s^–1

• 7.5 m s^–1

• 9.0 m s^–1

• 30 m s^–1

A motorcycle brakes so that it undergoes uniform deceleration from a speed of 12 m s^–1 to 8 m s^–1 over a distance of 10 m.

If the deceleration of the bicycle remains constant, what further distance will it travel before coming to rest?

• 8 m

• 10 m

• 12 m

• 20 m

Which feature of a graph allows acceleration to be determined?

• the area under a displacement-time graph

• the slope of a displacement-time graph

• the area under a velocity-time graph

• the slope of a velocity-time graph

The water surface in a deep well is 98.0 m below the top of the well. A person at the top of the well drops a heavy stone down the well.

Air resistance is negligible. The speed of sound in the air is 330 m s^–1.

What is the time interval between the person dropping the stone and hearing it hitting the water?

• 3.95 s

• 4.31 s

• 4.77 s

• 6.82 s

Two projectiles, X and Y, are fired into the air from the same place on level ground and reach the same maximum height, as shown.

Projectile X is fired vertically upwards and projectile Y is fired at an angle to the horizontal. Air resistance is negligible.

Which statement is not correct?

• Only X is at rest at its maximum height.

• Y is fired with greater speed than X.

• X takes longer time than Y to return to the ground.

• Y travels longer distance than X.