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A rocket starts from rest and moves upward from the surface of the earth. For the first 10s of its motion, the vertical acceleration of the rocket is given by a = (3.00 m/s^3)t, where the +y-direction is upward.
1) What is the height of the rocket above the surface of the earth at t = 10s ?
2) What is the speed of the rocket when it is 210m above the surface of the earth?
A box is pushed across the floor, slide with a constant velocity, and is opposed by a friction force of 25N. What is the magnitude of the force? Choose the correct answer. A.Less than 25N B.Zero C.Greater than 25N D.25n
A person exerts a horizontal force of F = 190 N in the test apparatus. (h of arm = 0.34 m. And h of flexor muscle= .054 m) Find the horizontal force M that his flexor muscle exerts on his fore arm.
Suppose you have a spherical balloon filled with air at room temperature and 1.0 atm pressure; its radius is 8cm. what's the balloon's new radius
In an RLC circuit, the following three elements are connected in series: a resistor of 45.0 ?, a 21.0-mH inductor, and a 0.450-µF capacitor. Find the power factor for the RLC series circuit
An electron moving at a speed of 0.68c collides head on with a positron alsomoving at 0.68c. Determine the energy and momentum of each photon
A small welding machine uses a voltage source of 120 V at 60 Hz. When the source is operating, it requires 1200 W of power, and the power factor is .75. FInd the rms current in the machine while operating
A coil with an inductance of 14.5 H and a resistance of R = 4.0 ohms is suddenly connected to a resistanceless battery with E = 184.2 V. What is the equilibrium current
An object at rest on a flat, horizontal surface explodes into two fragments, one seven times as massive as the other. How far does the lighter fragment slide
When four people with a combined mass of 290 kg sit down in a car, they find that the car drops 0.50 cm lower on its springs. What is the frequency of the car's vibration
The frequency of a slightly damped harmonic oscillator is Fd=1000 Hz. The amplitude of this oscillator drops to 1/(e^10) after 25 cycles. What are the undamped and resonant frequncies of the oscillator
Two forces F1 and F2, act at a point. F1 has a magnitude of 9.20N and is directed at an angle of 61.0 degrees above the negative x axis in the second quadrant. What is the magnittude of the resultant force
Sirius B is a white star that has a surface temperature (in kelvins) that is four times that of our sun. Sirius B radiates only 0.040 times the power radiated by the sun. Our sun has a radius of 6.96 × 108 m. Assuming that Sirius B has the same emiss..
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