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Review Learning Goal: To practice Problem-Solving Strategy 4.1 for projectile motion problems. A rock thrown with speed 12.0 m/s and launch angle 30.0° (above the horizontal) travels a horizontal distance of d 19.0 m before hitting the ground. From what height was the rock thrown? Use the value g = 9.800 m/s for the free-fall acceleration.

Find the height y, from which the rock was launched. Express your answer in meters to three significant figures. View Available Hint(s)

Review Peregrine falcons are known for their maneuvering ability. In a tight circular turn, a falcon can attain a centripetal acceleration 1.5 times the free-fall acceleration.

What is the radius of the turn if the falcon is flying at 18 m/s? Express your answer to two significant figures and include the appropriate units. Value Units Y= Submit Request Answer

Review A bullet is shot through two cardboard disks attached a distance D apart to a shaft turning with a rotational period T as shown. Derive a formula for the bullet speed u in terms of D T and a measured angle θ between the position of the hole in the first disk and that of the hole in the second. If required, use π, not its numeric equivalent. Both of the holes lie at the same radial distance from the shaft. θ measures the angular displacement between the two holes; for instance, θ = 0 means that the holes are in a line and θ π means that when one hole is up, the other is down. Assume that the bullet must travel through the set of disks within a single revolution View Available Hint(s) (Figure 1) ure 1 of 1 レ Bullet 2 (D Disk 1 Disk 2 Submit Previous Answers X Incorrect; Try Again; 9 attempts remaining

What is the wheels angular velocity, in rpm, 8.0 s later? Review Express your answer to two significant figures and include the appropriate units. A bicycle wheel is rotating at 46 rpm when the cyclist begins to pedal harder, giving the wheel a constant angular acceleration of 0.42 rad/s2 Value Units Submit Request Answer Part B How many revolutions does the wheel make during this time? Express your answer to two significant figures. N of revs-

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12.m/s 19.0 currLe Compene eqn® 1ニd &ubdeletm ㅝ tn aquecken@ に器一些,虬블 ?) fnr:/cessh 2. 9.8x19 5. 1409 m2 İllSじ TZ 1.5 χ 9.8

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