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A child operating a radio-controlled model car on a dock accidentally steers it off the edge. The car's displacement 0.9 s after leaving the dock has a magnitude of 7.9 m. What is the car's speed at
Let the x axis be parallel to the ground, the +y direction be vertically upward, and take as the origin the point on the ground directly below the top of the ramp. (a) How high above the ground is t
Your ears are sensitive to differences in pitch, but they are not very sensitive to differences in intensity. You are not capable of detecting a difference in sound intensity level of less than 1 dB
Electrostatic equilibrium: Find positions of four charges in a plane (+1 C, -1 C, +2 C, -2 C) that result in a stable equilibrium (zero net force on each charge, even if the charges move a bit). Rep
The electric field in an xy plane produced by a positively charged particle is 9.64(6.6 + 6.3) N/C at the point (3.9, 5.8) cm and 111 N/C at the point (5.3, 0) cm. What are (in cm) the (a)x and (b)y
Assume that the tennis ball will hit the ground below the cliff. Determine the equation for the height of the ball after t seconds.
A stretched string is fixed at both ends which are 410 cm apart. If the density of the string is 0.035 g/cm, and its tension is 600 N, what is the wave length of the 6th harmonic? Answer in units of
It then sails from the second island to the third island in a direction 70.0° west of north. Finally, it returns to the first island, sailing in a direction 28.0° east of south. (a) Calculat
A source emits a sound uniformly in all directions. a radial line is drawn from this source. on this line, determine the positions of the two points, 1.00m apart, such that the intensity level at on
The lowest frequency that an average, healthy human ear can detect is 20.0 Hz. What is the lowest harmonic number n that could be responsible for the "moaning" sound?
What is the magnitude of the electric field produced by a charge of magnitude 7.70 μ C at a distance of (a) 1.00 m and (b) 2.00 m?
A speedboat starts from rest and accelerates at +2.01 m/s2 for 7.35 s. At the end of this time, the boat continues for an additional 5.90 s with an acceleration of +0.518 m/s2. Following this, the b
Two stationary positive point charges, charge 1 of magnitude 3.35 and charge 2 of magnitude 1.55 , are separated by a distance of 42.0 . An electron is released from rest at the point midway between
She concludes correctly that the table is not level and correctly calculates its inclination from the above information. What is the angle of inclination?
These structures were all unknown until the invention of the electron microscope. Explain why light microscopes cannot reveal them.
What is the maximum value of h for which a collision occurs before the first ball falls back to the ground?
An empty parallel plate capacitor is connected between the terminals of a 18.1-V battery and charges up. The capacitor is then disconnected from the battery, and the spacing between the capacitor pl
He was supposed to travel due north for 4.8 km, but when the snow clears, he discovers that he actually traveled 7.8 km at 45° north of due east. (a) How far must he now travel to reach base cam
A beaker of mass 1.3 kg containing 2.7 kg of water rests on a scale. A 3.9 kg block of a metallic alloy of density 5300 kg/m3 is suspended from a spring scale and is submerged in the water of density
A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 4.02 m/s. The car is a distance d away. The bear is 32.8 m behind the tourist and running at 5.11 m
The coefficient of kinetic friction between the pavement and the car's tires is 0.500. How large is the available frictional force?
There are 3 point charges: q1=+4.0*10^-6 C, q2=+2.0*10^-6 C, q3=-3.0*10^-6 C. a.) Find the electric potential at Points A and B. b.) Find the electric potential energy of a -5.0nC charge placed at poi
An electron is accelerated by a constant electric field of magnitude 300N/C. a. Find the acceleration of the electron.
A proton is placed 4.65 mm from an infinitely long line of charge. The proton is observed to experience an acceleration of 3.34 x 107 m/s2, toward the line of charge, at the moment it is released. Ca
The electric dipole moment from is then placed into a uniform electric field that is 5.83 x 105 N/C in the negative y-direction. If released from rest, how much kinetic energy (rotational) the dipol