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A man with mass m =70.0 kg (weight = 154.0 lbs is walking towards a patio at 2.10 m/s (4.70 mph) when, at the last moment, he realizes the sliding glass door is closed. He puts out his hand suddenly to stop himself, and comes to a halt in 150.0ms. Find the magnitude of the average force exerted on the door by his hand.
a person pulls a crate with 120 n of force against 100 n of friction a distance of 5 meters. sketch a free body diagram
The electric field within the membrane separating the inside and outside of a biological cell is approximately 7.5 MV/m and is essentially uniform. what is the potential difference across the membrane
A 120-V rms voltage at 60.0 Hz is applied across an inductor, capacitor and a 100-? resistor in series. what is the rms value of the current in this circuit
A 5.7kg box is on a frictionless 44° slope and is connected via a massless string over a massless, find the tension in the string once the box begins to move
A structural I beam is made of iron. A view of its cross-section and its dimensions is shown in the figure, where d = 2 cm, w = 29 cm, h = 30 cm, How many atoms are there in this section
A 13 kg bucket of water of is suspended by a rope wrapped around a windlass that is a solid cylinder 0.400 m in diameter with mass 14.0 kg. The cylinder is pivoted on a frictionless axle through its center.
Valerie is able to do 1200 joules of work in 10seconds. Brett is able to do 5000 joules of work in 50 seconds. Who is more powerful.
A room with 2.9m high ceilings has a metal plate on the floor with V= 0V and a separate metal plate on the ceiling. How high does the ball go if the ceiling voltage is 3.5×10^6V
Neutron stars consist only of neutrons and have unbelievably high densities. A typical mass and radius for a neutron star might be 1.80e28 kg and 1.60e3 m. Find the density of such a star
A garden hose with a diameter of 0.67in. has water flowing in it with a speed of 0.82m/s and a pressure of 1.3 atmospheres. Find the pressure in the nozzle
two cars are at rest facing each other and 200 meters apart.if car one accelerates at 6.00ms2 up to maximum speed of
The distance to a star is approximately 7.60 1018 m. If this star were to burn out today, in how many years would we see it disappear? How long does it take for sunlight to reach Jupiter?
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