An amusement park game consists of throwing a quarter into a small bowl. If you win, you get to take home a giant purple stuffed elephant. The dish is on a shelf that is 0.4 m above the point where the quarter leaves your hand. The horizontal distance between the bowl and the place where the quarte...
PHYS Straighterline
An amusement park game consists of throwing a quarter into a small bowl. If you win,
you get to take home a giant purple stuffed elephant. The dish is on a shelf that is 0.4 m
above the point where the quarter leaves your hand. The horizontal distance between
the bowl and the place where the quarter leaves your hand is 1.8 m. Ignoring air drag, if
you toss the quarter at an angle of 60°, what initial velocity is needed to bring home the
giant purple stuffed elephant? - 4.8 m / s
If the x-component of a vector is 3 and the y-component is 4, what is the magnitude of
the vector? - 5
Which of the following is involved in uniform circular motion? - Constant angular velocity
As shown, a crate of oranges and a crate of apples, each with a different mass, are
attached by a rope (with tension Toa). A second rope (To) is attached to the crate of
oranges, and the entire system is pulled with a constant acceleration a by this rope.
Which of the following is true of the tensions? - Toa > To
How can you calculate the magnitude of a vector using scalar products? - Multiply it by
itself and take the square root.
Suppose you weigh an object and the reading you get from the scale is 0.0070 kg. How
many significant digits does your measurement have? - Two
Consider two objects sliding down an incline without rolling. If the objects don't have the
same mass, the heavier object will accelerate at a faster rate than the lighter one. -
False
Which of the following statements concerning friction between the surfaces of two
objects is correct? - The force of friction mostly depends on the nature of the two
surfaces.
Calculate x=vt+1/2at2, where v = 0.227 m/s. t = 11.1s, and a = 9.80 m/s2. - 606 m
Which of the following statements concerning friction is incorrect? - The force of static
friction ( fs ) between parallel surfaces in contact is given by: fs = μsN.
A car travels with a speed of 3.5 m / s, and then accelerates to 5.5 m / s in 4 s. Which of
the following is the average acceleration of the car? - 0.5 m / s2
If the cross product of a vector of length 5 and a vector of length 3 results in a vector of
length 10, what is the angle between them? - 42°
A vector is quantity that requires both magnitude and ________. - Direction
,King Kong is holding a woman on top of a skyscraper when she suddenly slips out of
his hand. How tall is the building if Superman has a minimum time of 2.30 s to catch the
woman before she hits the ground? - 25.9 m
Kylie throws Kyra a kiwi. The kiwi leaves Kylie's hand at a height of 1.3 m from the
ground and Kyra grabs it out of the air at a height of 1.6 m. Kylie throws the kiwi at an
angle of 33° relative to the horizontal. The kiwi is in the air for 1.1 s. How far apart are
Kylie and Kyra standing? (Assume there is no drag force that no wind is blowing.) - 9.6
m
A projectile is launched from a height of 250 m with initial horizontal velocity of 50 m/s.
What is the horizontal range of the projectile? - 357 m
Imagine that you push down on an object that is sitting on a frictionless table. Which of
the following diagrams includes all the forces acting on the object? - F W down, N up
Your cat chases a spider across the floor. Its position is a function of time is r +
(1.2m/s)ti + (0.7m + (0.5m/s2)t2)j, where the origin is the southwest corner of the floor.
Find the average speed of the cat between t = 0.0s and t = 4.0s - 2.3 m/s
The position of an object along the x-axis is described by the formula x = 3t 2 − 2t.
Which of the following are the correct formulas for the velocity and acceleration of the
object? - v = 6t − 2, a = 6
Using the conversion factor between kilograms and pounds, 1 kg = 2.205 lb, calculate
how many pounds are in 2.00 kg. - 4.41 lb
An experimental new ride at an amusement park begins by spinning patrons about a
circle of radius R with constant speed v. At some point during the ride the speed
doubles and the spokes extend, doubling the radius. After this occurs, what is the
acceleration of the patrons in terms of the original acceleration, a ? - 2a
Consider a mass of 85kg lying on the ground. The coefficient of static friction between
them is us = 0.65. What is the minimum force you need to apply in order to slide the
mass? - 541 N
When turning around a circle, a car is subject to a continuous force, but its speed does
not necessarily change. Why is this true? - The speed is not changing, but the direction
is.
A small mass is placed on a turntable that is rotating at 45 rpm. The centripetal
acceleration is ____________. - Greater when the mass is farther from the center of the
circle
How many significant figures are in the quantity?
, 9.86 m/s 2? - 3
Laura is listening to a record spinning at 45 rpm (revolutions per minute). When she
switches the speed selector on the record player to 33 rpm, it takes 2.7 seconds for the
record player to change to the new speed. How many revolutions does the record make
during this time? Assume that the angular acceleration of the record is constant. - 1.8
A 309 g glass rolls down an incline and onto a horizontal platform where it hits a
beverage can that is laying at rest on its side. The top of the incline is 11.0 cm above
the horizontal platform. The beverage can is initially at rest and weighs 7.35 N. Which of
following is the final velocity of the glass? - −0.612 m / s
This hourglass-shaped object is hung from a pivot point (round dot). Its center of gravity
is marked by a cross. If the object is free to rotate, what does it do? - It does not move.
You are sparring in karate class. Your opponent, standing directly in front of you, throws
a punch straight into your chest. What stance will best allow you to take this punch
without losing your balance? - left forward
A 0.500 kg steel ball is dropped from a height of 4.00 m onto a horizontal steel slab. The
collision appears elastic in that the ball rebounds to its original height. If the collision
lasts for 2.00 × 10−3 s, which of the following is the impulse imparted to the ball and the
average force applied to the ball during the collision? - I = 8.85 kg•m / s
F = 4.43 × 103 N
A spaceship is in space and currently at rest. The directive is given to accelerate from
rest to a speed of 2.90 × 103 m / s. If the fuel budgeted for this action is 400 kg,
which of the following is velocity of the exhaust gas required if the ship mass is 7.38
× 103 kg? - -5.5 × 104 [m / s]
A boat pulls a water skier who weighs 127 lbs at a constant speed. The tension in the
ski rope is 125 N. The skier makes a run that is 0.7 km down a long straight river. What
is the work done by the water skier on the boat? - −8.75 × 104 N • m
Which of the following is the general definition of impulse? - I = squiqqle E Fdt
A pendulum bob has mass of 0.750 kg and is on a pendulum arm of length 1.00 m. The
pendulum is pulled back so that the arm makes an angle of 60.0° from the vertical and
is then released. Which of the following is the speed of the mass when it reaches its
lowest point? - 3.13 m/s
An automobile of mass 900 kg is moving at a speed of 12.5 m/s when it encounters a
hill. At the bottom of the hill the car speed increases to 14.6 m/s. If the elevation of the
hill is 15.3 m, how much work did the brakes do while going down the hill? - -1.09x105 J
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