Mass of the seesaw
A 59-kg woman and a 73-kg man sit on a seesaw, 3.5 m long. Where is their center of mass? Neglect the mass of the seesaw.
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Where should a parent push with a force of 185 N in order to hold the teeter totter level? Where should the parent push with a force of 363 N to keep the teeter totter level?
At 1.15s after liftoff, the rocket clears the top of its launch platform, 63m above the ground. After an additional 4.75s it is 1.00km above the ground. calculate the magnitude of the average velocity of the rocket for:
A projectile is fired at an upward angle of 45° from the top of a 279 m cliff with a speed of 204 m/s. What will be its speed when it strikes the ground below? (Use conservation of energy.)
The coefficient of friction between the skis and the snow is 0.16. After the skier had been moving for 5.0 s, the friction of the snow suddenly increased and made the net force on the skier zero. What is the new coefficient of friction?
When identical amounts of heat are supplied to each, the glass bar reaches a temperature of 96 °C, while the other bar reaches 257.0 °C. What is the specific heat capacity of the other substance?
An attack helicopter is equipped with a 20- mm cannon that fires 57 g shells in the forward direction with a muzzle speed of 1130 m/s. The fully loaded helicopter has a mass of 3490 kg. A burst of 245 shells is fired in a 5.86 s interval. What is
A horizontal circular wire loop of radius 0.6 m lies in a plane perpendicular to a uniform magnetic ?eld pointing from above into the plane of the loop, has a magnitude of 0.57 T. If in 0.12 s the wire is reshaped from a circle into a square, but
Discuss your results with respect to the aims of the experiment rolling ball part velocity measurements. How does the measurement of the diameter of the ball obtained using the photogates compared with those obtained using the ruler and calipers?
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