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Solve the following questions:
Question 1: A person stands on a bathroom scale in an elevator and reads a weight of 709.7 N. What is the acceleration of the elevator if the person's mass is 78.0 kg? Make sure to include the correct sign in your answer, for the direction of the acceleration.
Question 2: The same person tries another experiment, using an accelerometer app on a mobile phone during a different elevator ride. The app shows an acceleration of +2.06 m/s2. What is the force exerted by the legs on the person's upper body, assuming that the legs are 32% of the person's mass?
If possible just a brief explanation how you got the answer for above questions?
a circular roller coaster has radius 30 m. The speed at the bottom is 37.0 m/s. A 50 kg girl is sitting on a scale. What does it read in kilograms at the top of the ride
Two cubes with sides of length 168.4 mm fit in a space that is 337.8 mm wide, as shown in the figure. One cube is made of aluminum, and the other is made of brass. What temperature increase is required for the cubes to completely fill the gap? (The l..
A certain copper wire has a resistance of 11.0?. What is the resistance of each piece
A boulder flies through the air at 11.8 meter per second with kinetic energy 314 Joule. Determine the boulder kinetic energy if its speed doubles
A stainless steel flask with volume 10 liters is filled with 1.4 moles of helium gas at 27 C. What is the average RMS speed of the helium atoms now
a motorcycle is following a car that is traveling at constant speed on a straight highway. initially the car and the
The nucleus of an atom consists of protons and neutrons (no electrons). A nucleus of a carbon-12 isotope contains six protons and six neutrons.
A 2.50-cm-diameter parallel-plate capacitor with a spacing of 0.900 mm is charged to 500 V. What is the total energy stored in the electric field
An electric motor rotating a workshop grinding wheel at a rate of 1.16 x 102 rpm is switched off. Find through how many radians has the wheel turned during the interval found in (a)
Moon effect. Some people believe that the Moon controls their activities. By what percent does your weight (as measured on a scale) decrease
A man pushes a heavy box up a plank inclined at an angle of 30. Calculate the ideal mechanical advantage of this incline plane
If the torque required to loosen a nut that is holding a flat tire in place on a vehicle has a magnitude of 40.0 N•m, find what minimum force must be exerted by the mechanic
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