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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.)
An air-traffic controller observes two aircraft on his radar screen. The first is at altitude 1200 m, horizontal distance 18.0 km and 21.0° south of west. The second aircraft is at altitude 900 m, horizontal distance 19.8 km and 23.0° south of west.
How much greater is an angular momentum of the Earth orbiting about the sun than the moon orbiting about the Earth? (Set up a ratio of angular momenta using data on inside back cover. The period of the moon is about 27.3 days.)
a road rises 1ft for every 100ft it travels horizontally it is said to have a 15 grade. if the road you are traveling on has a 5 % grade what is the angle of the road above the horizontal
A beam of light strikes the plane surface of borate flint glass at an angle of incidence of 57°. How much smaller is the angle of refraction for violet light of wavelength 400 nm than that for red light of wavelength 700 nm
In an electric motor, a coil with 100 turns of radius 2.0 cm can rotate between the poles of a magnet. The magnetic field strength is 0.20 T. When the current through the coil is50.0 mA, what is the maximum torque that the motor can deliver?
A cord of length 1.3 m is fixed at both ends. Its mass per unit length is 1.1 g/m and the tension is 11 N. (a) What is the frequency of the fundamental oscillation? Hz (b) What tension is required if the n = 3 mode has a frequency of 0.60 kHz? N
The electric field everywhere on the surface of a charged sphere of radius 0.170 m has a magnitude of 590 N/C, What is the net charge on the sphere
An object has a velocity 0(t) = (3.00 m/s) + (1.00 m/s) at time t = 0.00 s. The acceleration of the object is (t) = (2.00 m/s3)t + (1.00 m/s4)t2 . If the object is located at 0(t) = (1.00 m) + (-1.00 m) at time t = 0.00 s.
Three uniform meter sticks, each of mass , are placed on the floor as follows: stick 1 lies along the axis from = 0.290 m to = 1.29 m, compute the location of the center of mass of the meter sticks
a 50.8-cm diameter disk rotates with a constant angular acceleration of 2.10 rads2. it starts from rest at t 0 and a
How numerous forces act on the brick
A person pushes a 16.2-kg shopping cart at a constant velocity for a distance of 27.5 m on a flat horizontal surface. She pushes in a direction 32.3 ° below the horizontal. A 35.3-N frictional force opposes the motion of the cart. (a) What is the mag..
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