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A wire streches from the top of a vertical pole to a point on level ground 16 feet from the base of the pole. if the wire makes an angle of 62 degrees withe the ground, find the height of the pole
As a space craft approaches a planet, the rocket engines on it are fired to slow it down so it will go into orbit around the planet. The spacecraft's mass is 291 kg and the thrust (force) of the ro
A(n) 0.55 kg softball is pitched at a speed of 18 m/s. The batter hits it back directly at the pitcher at a speed of 25 m/s. The bat acts on the ball for 0.018 s. What is the magnitude of the averag
A hiker shouts toward a vertical cliff 740 m away. The echo is heard 4.00 s later. What is the speed of sound of the hiker's voice in air?
What is the minimum number of photons per second that an owl eye can detect if its pupil has a diameter of 8.5 mm and the light has a wavelength of 510 nm?
(b) What maximum height does the ball reach relative to the floor of the elevator cab? (c) At what rate does the speed of the ball change relative to the ground (sign and magnitude)? (d) At what rat
An object has a kinetic energy of 232 J and a momentum of magnitude 26.3 kg·m/s. Find the speed and the mass of the object.
Two stationary positive point charges, charge 1 of magnitude 3.80 nC and charge 2 of magnitude 1.55 nC, are separated by a distance of 35.0 cm. An electron is released from rest at the point midway
If the speed is small compared to the seed of light, what is the numerical magnitude B of the magnetic field made by the coils? What is the direction of this magnetic field?
Find the energy shifts/splitting of the ground state and the first excited state in terms of the matrix elements of U. How many independent parameters determine the energy splitting?
Calculate the electric field (magnitude and direction) at the upper right corner of a square 1.22 {rm m} on a side if the other three corners are occupied by 3.00×10-6 C charges. Assume that t
A 70 kg person throws a .05 kg snowball forward with a ground speed of 35 m/s. a second person, with mass 60 kg catches the snowball. both people are on skates. the first person is initially moving
The latent heat of fusion to melt lead at 327.0C is 22.9 kJ/kg and the specific heat of lead is 0.130 kJ/kgC. What is the energy needed to melt 100 grams of lead starting at 0C?
Three resistors connected in parallel each carry currents labeled I1, I2 and I3. Which of the following expresses the value of the total current IT in the combined system?
Draw the force vectors to some suitable scale showing the relative forces acting on the stone. B. Which is the longer vector, and why?
A sphere of mass 1.9 × 10-4 kg is suspended from a cord. A steady horizontal breeze pushes the sphere so that the cord makes a constant angle of 17° with the vertical. Find (a) the magnitu
How far must the microphone be moved to the right to find the first intensity minimum?
Two carts with masses of 12.5 kg and 4.5 kg, respectively, move in opposite directions on a frictionless horizontal track with speeds of 8.0 m/s and 5.0 m/s, respectively. The carts stick together
An object when orbiting the Earth at a height of three Earth radii from the center of the Earth has a weight of 3.00 N. What is the objects mass?
A 232 g ball is tied to a string. It is pulled to an angle of 5.0 degree and released to swing as a pendulum. A student with a stopwatch finds that 23 oscillations take 20 s. What is the length of t
At high noon, the Sun delivers 1.10 kW to each square meter of a blacktop road. If the hot asphalt loses energy only by radiation, what is its equilibrium temperature?
How much more precisely should this quantity be determined in order to make the uncertainty terms associated with L and r equal to each other?
You are asked to design a parallel-plate capacitor having a capacitance of 1.00 F and a plate separation of 1.00 mm. Calculate the required surface area of each plate. Is this a realistic size for
A rock fired at an initial angle of 40° lands 230 m downrange on top of a hill that is 19 m above the original launch elevation. (a) Neglecting air resistance, determine the initial speed of the r
A car traveling at 16.0 m/s runs out of gas while traveling up a 23.0 degree slope.How far up the hill will it coast before starting to roll back down?