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A train at a constant 69.0 km/h moves east for 46 min, then in a direction 56.0° east of due north for 17.0 min, and then west for 58.0 min. What are the (a) magnitude (in km/h) and (b) angle (r
A 69.0 {rm kg} person stands on a lightweight diving board supported by two pillars, one at the end of the board, the other 1.50 {rm m} away. The pillar at the end of the board exerts a downward fo
The pilot of an airplane traveling 250 km/h wants to drop supplies to flood victims isolated on a patch of land 170 m below. The supplies should be dropped how many seconds before the plane is dire
The nuclide 55Ca has a half-life of 2.737 years, decaying by electron capture to 55Mn. Find the mean life and the decay constant for this radionuclide. A source of this isotope has an activity of 0
A pair of speakers separated by 0.900 m are driven by the same oscillator at a frequency of 672 Hz. An observer originally positioned at one of the speakers begins to walk along a line perpendicula
Where the free-fall acceleration is 3.7 meters per second ^2. Find the velocity with which it hits the ground. answer in units of m/s.
A 400kg ruck is moving with a velocity of 40km/h.it is stopped 25m beyond the point at which the brakes are applied. Find the retarding force
A 23 kg child sits in a swing supported by two chains, each 1.6 m long. The acceleration of gravity is 9.8 m/s2 . If the tension in each chain at the lowest point is 203 N, find the child's speed a
Write the displacement vector from aircraft 1 to aircraft 2 in "cylindrical" coordinates. That is, write a 3-component vector (r, θ, z) whose first two components are the polar coordinates of
A toy train is pushed forward and released at x_0 = 2.0 m with a speed of 2.0 m/s. It rolls at a steady speed for 2.0 s, then one wheel begins to stick. The train comes to a stop 6 m from the point
Hanging on the ladder are two masses. The first mass is 9.9 kg and is located 5% from the ladder's base. The second mass is 7.1 kg and is located 4% from the top of the ladder. What is the smallest
A candle is placed 16.0 cm in front of a convex mirror. When the convex mirror is replaced with a plane mirror, the image moves 7.5 cm farther away from the mirror. Find the focal length of the conv
A 0.390--long cylindrical capacitor consists of a solid conducting core with a radius of 1.30 and an outer hollow conducting tube with an inner radius of 2.15 . The two conductors are separated by
The ladder makes an angle of 55 with the horizontal and the friction between the ladder and floor is 300.5N, How far up the ladder can the woman of mass 53kg go before the ladder start to slip?
How fast (in rpm) must a centrifuge rotate if a particle 8.00 cm from the axis of rotation is to experience an acceleration of 125,000 g's?
The drawing shows a horizontal beam of light that is incident on a prism made from ice. The base of the prism is also horizontal. The prism (n = 1.31) is surrounded by oil whose index of refraction
Your driveway is 3 meters long, and your house is 2.3 meters above the street. Assuming no friction, what is the speed of a 0.5 kg toy truck at the bottom of the driveway, if it starts from rest at
a- What force do you need to exert to accomplish this? b- what are the magnitude and direction of the friction force on the upper box?
What are (a) the period of the motion, and the magnitude of her centripetal acceleration at (b) the highest point and (c) the lowest point?
Find the induced current I in the resistor. (b) What horizontal force F is required to keep the axle rolling at constant speed?(c) Which end of the resistor, a or b, is at the higher electrical pote
Suppose you began taking data when m1 was on the ground and stopped taking data at the exact moment that m2 touched the ground (or when m2 is at y = 0 m, where y = 0 m is the floor of the lab). Wha
A cylinder with a piston contains 0.250 mol of oxygen at 240000 pascal and 355 kelvin. the oxygen may be treated as an ideal gas. the gas first expands isobarically to twice its its original volume
What are the analytical forms of the LQ model for cell survival and the MTSH model. What are the advantages of either of these models holds relative to the simple exponential model? What is the prop
Four identical charges in a square all have a magnitude of 12 microcoulombs (but some are positive and some negative), and the length of each side is 18 cm. what is the electric field at origin O?
a car with a mass of 1050 kg crashes into a wall. the car's velocity immidately before collision was 14ms and the bumper is compressed like a spring constant 1.14 N/m. what is the maximum deformatio