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Astrology, that unlikely and vague psuedoscience, makes much of the position of the planets at the moment of birth. The only known force a planet exerts on earth is gravitational.
a) Calculate the gravitational force exerted on a 3.00 kg baby by a 90 kg father 0.150 away at birth (assisting so he is close).
b) Calculate the force on the baby due to Jupiter if it is at its closest to earth, some 6.29xe11 m away, showing it to be comparible to that of the father. The mass of Jupiter is about 1.90x e27 kg. Other objects in the room and the hospital building also exert similar gravitational forces. (of course, there could be unknown force acting, but scientist first need to be convinced that there is even an effect, much less that an unknown force causes it.)
A hydrogen atom in a state having a binding energy (the energy necessary to remove an electron) of 0.378 eV makes a transition to a state by an excitation energy (the difference among the energy of the state and that of the ground state) of 13.056 eV..
at t 0 a stone is dropped from the top pf a cliff above a lake. another stone is thrown downward 1.6s later from the
Light travels from air through a flat sheet of glass (n =1.5) into water. If the angle of incidence in air is 39°, what is the angle of the refracted ray in water
Suppose 12.2 g of oxygen (O2) is heated at constant atmospheric pressure from 25.3°C to 141°C. How many moles of oxygen are present
Mary needs to row her boat across a 100-{rm m}-wide river that is flowing to the east at a speed of 1- {rm m/s}. Mary can row the boat with a speed of 2- {rm m/s} relative to the water.
When 4625 J of heat are added to a 0.13-m-long silver bar, its length increases by 4.59 10-3 m. What is the mass of the bar
Kelli weighs 417 N, and she is sitting on a playground swing that hangs 0.44 m above the ground. Her mom pulls the swing back and releases it when the seat is 1.00 m above the ground. Imagine that air resistance is negligible.
The wheel of a bicycle have an angular velocity of +20.0 rad/s. Then, the brakes are applied. In coming to rest, each wheel makes an angular displacement of +15.92 revolutions.
Consider a homemade capacitor, which consists of 2 8.5" x 11" aluminum foil sheets separated by 10 sheets of paper. Estimate the capacitance of this device. What effect does the paper have on the capacitance
If a iron core of a collapsing star initially spins with a rotational frequency of fo=3.4 per second and the core radius decrease during the collapse by a factor of 24. what is the rotational frequency of the iron core at the end of collapse
two stones are thrown simultaneously one straight upward from the base of a cliff and the other straight downward from
The electric field everywhere on the surface of a charged sphere of radius 0.470 m has a magnitude of 865 N/C, find distribution of charge inside the sphere
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