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Q1. A chair of weight 125 N lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of F = 35.0 N directed at an angle of 42.0 below the horizontal and the chair slides along the floor. Using Newton's laws, compute the magnitude of the normal force that the floor exerts on the chair.
Express your answer in Newton's.
Q2. Two concrete spans of a 220 m long bridge are placed end to end so that no room is allowed for expansion. If a temperature increase of 20.0°C occurs, what is the height y to which the spans rise when they buckle?
Suppose a spaceship runs out of fuel near a star. The crew erects a square, white sail 7.06 km on a side, Find the temperature of the star's surface
Determine the escape velocity from the Sun for an object at the Sun's surface (r = 7.5 × 105 km, M = 2.0 × 1030 kg)
A moon orbits a planet of unknown mass with a period of 1.8 days. If the radius of the moon's orbit is 420,000,000 meters, Determine the centripetal acceleration of the moon
A small fly of mass 0.27 grams is caught in a spider's web. The web vibrates predominately with a frequency of 4.50 Hertz. What is the value of the effective spring constant stiffness constant for the web.
An adult exerts a horizontal force on a sewing that is suspended by a rope of length L, holding it at an angle x with the vertical. The child in the swing has a weight W and dimensions that are negligible compared to L.
A series AC circuit contains a resistor, an inductor of 200 mH, a capacitor of 5.60 µF, and a source with ?Vmax = 240 V operating at 50.0 Hz. Calculate the inductive reactance
If a material increases its length from 130 m to 132.60 m when its temperature is rasied 155 degrees C, what is its coefficient of linear expansion
a block weighing 16.8 N, which can slide without friction on an incline at angle ? = 45.0°, is connected to the top of the incline by a massless spring of spring constant 125 N/m. With what period does it oscillate
Find out (a) the coefficient of kinetic friction between m2 and the incline, (b) the acceleration of each mass, and (C) the tension in the string.
Suppose you are 69 cm from a plane mirror. What area of the mirror is used to reflect the rays entering one eye from a point on the tip of your nose if your pupil diameter is 4.90mm.
A dog running in an open field has components of velocity vx = 2.4m/s and vy = -2.5m/s at time t1 = 11.3s . For the time interval from t1 = 11.3s to t2 = 18.0s , What is the magnitude of the dog's velocity
Big yellow fishing swimming at 2.0m/s swallows little green fish at rest. What fraction of big yellow fish's initial kinetic energy was lost is this collision
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