A stone is thrown with an initial speed of 15 m/s at an angle of 53° above the horizontal from the top of a 40-m building. If g = 9.8 m/s2 and air resistance is negligible, then what is the magnitude of the horizontal component of velocity as the rock strikes the ground?
a. 7.5 m/s
c. 12 m/s
b. 9.0 m/s
d. 29 m/s
B
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Interstellar matter is distributed very evenly throughout the galaxy
Indicate whether the statement is true or false
A plane has an airspeed of 142 m/s. A 30.0 m/s wind is blowing southward at the same time as the plane is flying. What must be the heading of the plane in order to move directly eastward relative to the ground?
A) 77.8° north of east B) 55.3° north of east C) 12.2° north of east D) 11.9° north of east E) 78.1° north of east
The diagram below illustrates two stars in a visual binary system and the center of mass of this system. Based on this diagram, what is the ratio of the mass of star A to the mass of star B?
a.
2 to 1
b.
1 to 2
c.
2 to 3
d.
3 to 2
e.
1 to 3
The position of an object that is oscillating on an ideal spring is given by the equation x = (12.3 cm) cos[(1.26s-1)t]. At time t = 0.815 s,
(a) how fast is the object moving? (b) what is the magnitude of the acceleration of the object? What will be an ideal response?