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The hydraulic dredge shown in Fig. P5.51 is used to dredge sand from a river bottom. Estimate the thrust needed from the propeller to hold the boat stationary. Assume the specific gravity of the sand/water mixture is SG = 1.4.
Problem A small mirror is attached to a vertical wall, and it hangs a distance of 1.59 m above the floor. The mirror is facing due east, and a ray of sunlight strikes the mirror early in the morning and then again later in the morning.
at a certain time a particle had a speed of 70 ms in the positive x direction and 1.2 s later its speed was 39 ms in
What is the distance between two converging lenses, each of ofcal length f and used in combination to become a telescope
A university physics department buys 100m of string and determines its total mass to be 0.150kg. what is the required string tension
A turbine blade rotates with angular velocity w(t)= 2.00 rad/s - 2.100 rad/s^3 t^2. What is the angular acceleration of the blade at t = 9.1 s
Determine the energy needed to accelerate a spaceship with a mass m = 25 × 103 kilogram to a speed of 0.40c. Compare this number with the approximate annual energy usage of Earth, 1021 Joule
As soon as a traffic light turns green, a van speeds up from rest to 56.0 mi/h with fix acceleration 9.00 mi/h-s. Find by what maximum distance does the bicycle lead the van
A hydrogen atom, initially at rest, has its electron in then = 4 state. The electron then makes a transition to the ground state, and the atom emits a photon in the process. What is the recoil speed of the hydrogen atom?
find the frequency ration rwwn at which the amplitude of a single degree of freedom damped system attains the maximum
In a museum exhibit, three equal weights are hung with identical wires. Each wire can support a tension of no more than 72.0N without breaking. Under these conditions, what is the tension in the middle wire
When light of wavelength 350 nm falls on a potassium surface, electrons are emitted having a maximum kinetic energy when the stopping voltage, Vs = 1.30 V. Find Work function of potassium and The cut-off wavelength.
How many kilograms of water at 100.0 C could be converted to steam by the addition of 1.13 x 10^7 joules of thermal energy.
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