An object changes its velocity from V₁ to V₂ during a time interval Δt. Which of the following is the correct direction for the object’s acceleration?

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Tags

NGSS.HS-PS2-1

Which of the following pairs of graphs shows the distance traveled versus time and the speed versus time for an object uniformly accelerated from rest?

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Tags

NGSS.HS-PS2-1

A ball is thrown and follows the parabolic path shown above. Air friction is negligible. Point Q is the highest point on the path. Points P and R are the same height above the ground. Which of the following diagrams best shows the direction of the acceleration of the ball at point P?

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Tags

NGSS.HS-PS2-1

A ball is thrown and follows the parabolic path shown above. Air friction is negligible. Point Q is the highest point on the path. Points P and R are the same height above the ground. Which of the following best indicates the direction of the velocity, if any, on the ball at point Q?

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• v = 0 m/s at point Q

At time t = 0, car X traveling with speed v₀ passes car Y. which is just starting to move. Both cars then travel on two parallel lanes of the same straight road. The graphs of speed v versus time t for both cars are shown above. Which of the following is true at time t = 20 seconds? Select two answers.

• car Y is behind car X

• car Y is passing car X

• car Y is in front of car X

• both cars have the same velocity

As a rocket moves away from the Earth's surface, the rocket's weight (i.e., F_{Earth on rocket})

• increases.

• decreases.

• remains the same.

• depends on how fast it is moving.

Tags

NGSS.HS-PS2-4

In the following problem, the word “weight” refers to the force a scale registers. If the Earth were to increase its rotating speed, but not change shape,

• the weight of an object at the equator would increase.

• the weight of an object at the equator would decrease.

• the weight of an object at the North Pole would increase.

• the weight of an object at the North Pole would decrease.

Tags

NGSS.HS-PS2-4

A hypothetical planet orbits a star with mass 4 times the mass of our sun. The planet’s orbital radius is the same as the Earth’s. Approximately how many Earth years does it take for the planet to complete one orbit?

• $\frac{1}{2}$

• $\frac{1}{\sqrt{2}}$

• $1$

• $\sqrt{2}$

Tags

NGSS.HS-ESS1-4

NGSS.HS-PS2-4

A satellite of mass m moves in a circular orbit of radius R around a planet of mass M with speed v. Which of these must be true for the satellite? Choose two answers.

• The net force on it is MR/v²

• Its acceleration is GM/R

• Its orbital velocity is (GM/R)^1/2

• Its orbital period is 2R/v

Tags

NGSS.HS-ESS1-4

NGSS.HS-PS2-1

NGSS.HS-PS2-4

A ball of mass m is suspended from two strings of unequal length as shown below. The tensions T₁ and T₂ in the strings must satisfy which of the following relations?

• T₁ = T₂

• T₁ > T₂

• T₁ < T₂

• T₁ + T₂ = mg

Tags

NGSS.HS-PS2-1