Exam 4: Motion in Two and Three Dimensions

An airplane is flying north at 500 km/h. It makes a gradual 180 $\degree$ turn at constant speed, changing its direction of travel from north through east to south. The process takes 40 s. The average acceleration of the plane for this turn in km/h.s is:

Which of the following is NOT an example of accelerated motion?

A bullet shot horizontally from a gun:

Which of the following is a vector quantity?

An airplane makes a gradual 90 $\degree$ turn while flying at a constant speed of 200 m/s. The process takes 20.0 seconds to complete. For this turn the magnitude of the average acceleration of the plane is:

A boy wishes to row across a river in the shortest possible time. He can row at 2 m/s in still water and the river is flowing at 1 m/s. At what angle $\theta$ should he point the bow (front) of his boat?

A car rounds a 20-m radius curve at 10 m/s. The magnitude of its acceleration is:

A large cannon is fired from ground level over level ground at an angle of 30 $\degree$ above the horizontal. The muzzle speed is 980 m/s. Neglecting air resistance, the projectile will travel what horizontal distance before striking the ground?

Velocity is defined as:

The airplane shown is in level flight at an altitude of 0.50 km and a speed of 150 km/h. At what distance d should it release a heavy bomb to hit the target X? Take g = 10 m/s².

A particle moves at constant speed in a circular path. The instantaneous velocity and instantaneous acceleration vectors are:

A stone is tied to the end of a string and is swung with constant speed around a horizontal circle with a radius of 1.5 m. If it makes two complete revolutions each second, its acceleration is:

A jet plane in straight horizontal flight passes over your head. When it is directly above you, the sound seems to come from a point behind the plane in a direction 30 $\degree$ from the vertical. The speed of the plane is:

A dart is thrown horizontally toward X at 20 m/s as shown. It hits Y 0.1 s later. The distance XY is:

A bomber flying in level flight with constant velocity releases a bomb before it is over the target. Neglecting air resistance, which one of the following is NOT true?

A plane traveling north at 200 m/s turns and then travels south at 200 m/s. The change in its velocity is:

An object, tied to a string, moves in a circle at constant speed on a horizontal surface as shown. The direction of the displacement of this object, as it travels from W to X is:

A stone is tied to a 0.50-m string and whirled at a constant speed of 4.0 m/s in a vertical circle. The acceleration at the bottom of the circle is:

Acceleration is defined as:

A stone is thrown outward from the top of a 59.4-m high cliff with an upward velocity component of 19.5 m/s. How long is stone in the air?