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Pat builds a track for his model car out of wood. The track is 7.00 cm wide, 4.00 m long, and 1.78 m high, and is solid. The runway is cut such that it forms a parabola by the equation y = (x - 4)2
A bird is flying directly toward a stationary bird-watcher and emits a frequency of 1250 Hz. The bird-watcher, however, hears a frequency of 1290 Hz. What is the speed of the bird, expressed as a pe
The tires of a car make 45 revolutions as the car reduces its speed uniformly from 100 km/h to 30 km/h. The tires have a diameter of 0.80 m. (a) What was the angular acceleration in rad/s^2?
What is the magnitude of the potential difference between two points that are 1.08 cm and 2.7 cm from a proton?
A hospital patient has been given 131I (half life= 8.04 days) which decays at 4.5 times the acceptable level for exposure to the general public. How long must the patient wait to reach the acceptabl
The charge per unit length along the semicircle is described by the expression lambda = lambda0cosθ. The total charge on the semicircle is 13.7 µC. Calculate the total force on a charge
Two powerless rockets are on a collision course. Rocket 1 is movingat 0.800c relative to Liz, an Earth observer. Rocket 2 is moving at-0.600 c relative to Liz. The two rockets are initially 2.52 x1
A steel rod 2.00 m long is to be used to pry up one end of a 400-kg crate. If a workman can exert a downward force of 400 N on one end of the rod, where should he place a block of wood to act as th
Draw a diagram of the same problem above. if the bullet passes through the wood and continues at 100 m/s east, what is the velocity of the block of wood?
The radius of a solid sphere is measured to be (6.50+-0.20) cm, and its mass is measured to be (1.85+-0.02) kg. Determine the density of the sphere in kilograms per cubic meter and the uncertainty
How much work is required to stop an electron (m = 9.11 multiplied by 10-31 kg) which is moving with a speed of 1.72 multiplied by 106 m/s? Could you please explain?
A bat can detect small objects such as an insect whose size is approximately equal to one wavelength of the sound the bat makes. If bats emit a chirp at a frequency of 68.2 kHz, and the speed of soun
After the gas is ejected, the mass of the astronaut (now wearing a partially empty propulsion unit) is 165 kg. What percentage of the gas propellant in the completely filled propulsion unit was depl
If a free electron is released at rest from the negative plate, find its speed when it reaches the positive plate. Find the time it takes the electron to travel across the 2.2 mm gap.
How many excess electrons must be present on each sphere if the magnitude of the force of repulsion between them is 4.57x10^-21 newtons?
A package has mass of 200 kg is on a horizontal floor. Resistance to its motion other than that due to friction is negligible. The first attempt to move the package is by pulling it with a force of
A hospital patient has been given 131I (half-life = 8.04 days) which decays at 6.3 times the acceptable level for exposure to the general public. How long must the patient wait to reach the acceptab
You are shooting a basketball into a hoop of diameter d that is located l meters away and h meters high. Assume that the horizontal distance to the hoop is measured with its center and you and your
A current of 0.300 A through your chest can send your heart into fibrillation, ruining the normal rhythm of heart beat and disrupting the flow of blood (and thus oxygen) to your brain. If that curre
For what value of Q (in µC) will the moving particle execute circular motion? (Neglect the gravitational force on the particle.)
The wavelength of one sound wave is 0.81 m. The wavelength of a second sound wave is a little bit longer. When the two sound waves are superimposed on each other, we hear a 1.1 -Hz beat.
How far (cm) from the end of the string should I put my finger if I want the pitch of the note to be 539 Hz?
The speed of sound in aluminum is 5000 m/s. We excite standing waves in a rod of aluminum 1.30 m long such that there is an antinode at each end of the rod and only one node half-way between. Find t
Suppose we excite a two-loop standing wave in a rope using tension of 1.14 N. What tension (N) should we apply to the rope if we want to excite a one-loop standing wave with the same frequency?
A long spring is stretched and attached to two walls 5.42 m apart. The mass of the spring is 276 g. The tension in the spring is 8.7 N. What will be the frequency (Hz) of a standing wave with three