The speed of an aircraft in still air is 200 km h^–1.

The wind blows from the west at a speed of 85.0 km h^–1.

In which direction must the pilot steer the aircraft in order to fly due north?

• 23.0° east of north

• 23.0° west of north

• 25.2° east of north

• 25.2° west of north

Two balls of masses m and 2m with initial velocities 2v and v collides as shown. After the collision, the mass m travels to the right a velocity of v. How much kinetic energy is lost?

• 0.10 mv²

• 0.25 mv²

• 0.33 mv²

• 0.50 mv²

Tags

NGSS.HS-PS2-2

The graph shows the extension of a sample of a type of rubber as different loads F are applied and then gradually removed.

What is the best estimate of the strain energy in the rubber when a load of 80 N is applied?

• 0.40 J

• 0.64 J

• 0.88 J

• 1.3 J

Tags

NGSS.HS-PS2-1

A straight tube is closed at one end and has a loudspeaker positioned at the open end. The frequency of the loudspeaker is initially very low and is increased slowly. A series of loudness maxima are heard.

The stationary wave which gives the first maximum has a node at the closed end and an antinode at the open end. The frequency of the loudspeaker is f₁ when the first maximum is heard.

What is the frequency of the loudspeaker when the fourth maximum is heard?

• 1.75 f₁

• 2 f₁

• 4 f₁

• 7 f₁

Tags

NGSS.HS-PS4-1

The electric current in a wire may be calculated using the equation I = Anvq.

Which statement is not correct?

• n is the number of charge carriers per unit volume of the wire.

• nA is the number of charge carriers per unit length of the wire.

• q is the charge of each charge carrier.

• v is the velocity of each charge carrier.

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

A cell of internal resistance r and electromotive force (e.m.f.) E is connected in series with a resistor of resistance R.

The resistance R and the e.m.f. E remain fixed. The internal resistance r of the cell changes over time.

Which graph best shows the variation of the current I in the circuit with the internal resistance r?

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Tags

NGSS.HS-PS2-5

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 constant, a constant

• v constant, a decreasing

• v increasing, a constant

• v increasing, a decreasing

Tags

NGSS.HS-PS2-1

Water waves of wavelength λ are incident normally on an obstacle with a narrow gap. The width of the gap is equal to λ. The waves from the gap emerge over an angle θ as shown.

The gap is slowly widened. Which changes, if any, occur to θ and to the wavelength of the emerging waves?

• θ decreases, λ remains the same

• θ increases, λ remains the same

• θ remains the same, λ decreases

• θ remains the same, λ increases

Tags

NGSS.HS-PS4-1

Which graph could show how the resistance R of a filament lamp varies with the applied potential difference (p.d.) V, as V is increased to the normal operating p.d.?

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In the circuit shown, all the resistors are identical and all the ammeters have negligible resistance.

The reading A₁ is 0.6 A. What are the readings on the other ammeters?

• A₂ = 1.0 A; A₃ = 0.3 A; A₄ = 0.1 A

• A₂ = 1.4 A; A₃ = 0.6 A; A₄ = 0.2 A

• A₂ = 1.8 A; A₃ = 0.9 A; A₄ = 0.3 A

• A₂ = 2.2 A; A₃ = 1.2 A; A₄ = 0.4 A