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Your 3.90 kg physics book is next to you on the horizontal seat of your car. The coefficient of static friction between the book and the seat is 0.660, and the coefficient of kinetic friction is 0.560. Suppose you are traveling at 90.0 km/h = 25.0 m/s and brake at a constant rate to a stop over a distance of 80.4 m.
(a) Will the book start to slide over the seat? yes no
(b) What force does the seat exert on the book in this process? It is ............... upward and backward at .......... ° with the horizontal.
If a ball is thrown upwards at 20 ft/sec, the height h after t seconds is given by h = -16t^2 + 20t. How many seconds does it take for the ball to reach its greatest height, and what is this height.
A satellite is circling a small planet at a speed of 3.60 rev/day. If the satellite's orbit has a diameter of 30,000 km, how fast is the satellite moving
How large a force F2 must the second crewman pull so that the net force of the two crewmen is in the forward direction.
A cyclist intends to cycle up a hill whose vertical height is 170m. Assuming the mass of bicycle plus cyclist is 75kg , calculate how much work must be done against gravity
A small, 300 {rm g} cart is moving at 1.30 {rm m/s} on an air track when it collides with a larger, 3.00 {rm kg} cart at rest. After the collision, the small cart recoils at 0.890 {rm m/s}.
Two narrow slits 41 µm apart are illuminated with light of a wavelength 604 nm. What is the angle of the m=3 bright fringe in degrees.
What are the components of the ships displacement
Two point charges, +3.75 µC and -6.05 µC, are separated by 1.21 m. What is the electric potential midway between them
A sample of 23892U is decaying at a rate of 455 decays/s . The half-life is 4.468E9yr. compute the mass of the sample
Two resistors, of R1 = 2.93 ? and R2 = 6.69 ?, are connected in series to a battery with an EMF of 24.0 V, Find the current I1 through the first resistor
An eagle is flying horizontally at 5.7 m/s with a fish in its claws. It accidentally drops the fish. (a) How much time passes before the fish's speed doubles? (b) How much additional time would be required for the speed to double again?
What is the maximum speed of the mass. What is the radial acceletation experience by mass while it remains at its max. angular speed.
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