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A metal rod is suspended from vertical springs attached to each end of the rod. The 40g rod causes the springs to stretch 15 centimeter. When a horizontal magnetic field is introduced and a current of 2.5 amps passes through the rod the springs stretch an additional 10 centimeter. Compute the strength of the magnetic field?
A block of mass 7.1 kg is pulled along a horizontal frictionless floor by a cord that exerts a force of 41.0 N at an angle 34.9° above the horizontal, What is the magnitude of the normal force exerted on the mass
The sound level in decibels is typically expressed as ? = 10 log (I/I0), but since sound is a pressure wave, the sound level can be expressed in terms of a pressure difference. Intensity depends on the amplitude squared, so the expression is ? = 2..
The bones a a saber-toothed tiger are found to have an activity per gram of carbon that is 14.5 % of what would be found in a similar live animal. How old are these bones
q1. two blocks of the same mass m joined by a spring of negligible mass and with spring constant k are being lowered at
A stone is thrown from the top of a cliff that is 34.6 m high at a velocity of 13 m/s 230 above the horizontal. How long does it take to hit the ground below the cliff
Calculate the terminal velocity for a pollen grain falling through the air using the drag force equation. Assume the pollen grain has a diameter of 7 µm and a density of 0.7 g/cm3
A horizontal force of 2 N does nothing to move a large book along a desk, but a force of 1.8 N can keep the book sliding at constant speed on the same desk. Explain
Two packing crates of masses m1 =10.0 kg and m2 = 6.00 kg are connected by a light string that passes over a frictionless pulley as in the figure below.The 6.00 kg crate lies on asmooth incline of angle 45.0°. Find the acceleration of the 6.00 kg ..
A hydrogen atom is in its ground state when its electron absorbs a 48 keV photon. What's the energy of the resulting free electron
A student sits on a rotating stool holding two 4 kg objects. When his arms are extended horizontally, the objects are 0.8 m from the axis of rotation, and he rotates with angular speed of 0.74 rad/sec. Calculate the final angular speed of the stude..
The power supply for a pulsed nitrogen laser has a 0.060micro-F capacitor with a max voltage rating of 25 kV. what is the power of the laser pulse
A projectile is launched from ground level with an initial speed of 52.2 m/s. Find the launch angle (the angle the initial velocity vector is above the horizontal) such that the maximum height of the projectile is equal to its horizontal range. (I..
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