Get college assignment help at uniessay writers Algol consists of a 3.7 MSun main-sequence star and a 0.8 MSun subgiant. Why does this seem surprising, at least at first?
A rock of mass 44 kg accidentally breaks loose from the edge of a cliff and falls straight down. The magnitude of the air resistance that opposes its downward motion is 252 N. What is the magnitude of the acceleration of the rock?
Eight books, each 9.0 cm thick with mass 1.0 kg, lie flat on a table. How much work is required to stack them one on top of another?
Learning Goal: To practice Problem-Solving Strategy 8.1 Static equilibrium problems. When you lift an object by moving only your forearm, the main lifting muscle in your arm is the biceps. Suppose the mass of a forearm is 1.50 kg. If the biceps is connected to the forearm a distance d_biceps = 3.50 cm from the elbow, how much force F_biceps must the biceps exert to hold a 650 g ball at the end of the forearm at distance d_ball = 37.0 cm from the elbow, with the forearm parallel to the floor? How much force F_elbow must the elbow exert? What is the horizontal distance between the elbow and the point where the weight of the forearm acts?
A 3.3 kg block slides along a frictionless hor- izontal with a speed of 6.2 m/s. After sliding a distance of 2 m, the block makes a smooth transition to a frictionless ramp inclined at an angle of 33◦ to the horizontal. The acceleration of gravity is 9.81 m/s2 . How far up the ramp does the block slide before coming momentarily to rest?
A 280 block on a 52.0 -long string swings in a circle on a horizontal, frictionless table at 55.0. What is the speed of the block? What is the tension in the string?
The lower weight is a light bag filled with sand. Suppose a pin pokes a hole in the bag and the sand slowly leaks out while the puck is revolving. What will be the puck’s speed after all of the sand is gone?
A 1000-N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end. A 1960-N crate hangs from the far end of the beam. Using the data shown in the figure, find (a) the magnitude of the tension in the wire and the magnitudes of the (b) horizontal and (c) vertical components of the force that the wall exerts on the left end of the beam.
a professors door is .91m wide, 2.0 m high and 4 cm thick. has a mass of 25kg, and pivots on a friciotnless hinges. whe door is open and at rest, the door closer exerts a torque of 5.2Nm. what is least force that you need ot appply to door to hold open
A person pulls on a 50 kg desk with a 200N force acting at 30° angle above the horizontal. The desk does not budge. Draw a force diagram for the desk.
Get college assignment help at uniessay writers A block of mass 12.0 kg slides from rest down a frictionless 34.0° incline and is stopped by a strong spring with k = 1.0 104 N/m. The block slides 3.00 m from the point of release to the point where it comes to rest against the spring. When the block comes to rest, how far has the spring been compressed?
A rifle is aimed horizontally at a target 29 m away. The bullet hits the target 2.3 cm below the aiming point. Neglect air resistance. (a) What is the bullet’s time of flight? 1 s (b) What is its muzzle velocity? 2 m/s (in the bullet’s initial horizontal direction)
If the average gauge pressure in the artery is 1.02E 4 Pa, what must be the minimum height, h of the bag in order to infuse glucose into the artery? Assume that the specific gravity of the solution is 1.06.
If the particle is sent back through the magnetic field (along the same initial path) but with 3.00 times its previous kinetic energy, how much time does it spend in the field during this trip?
Two ants race across a table 76 cm long. One travels at 5.44 cm/s and the other at 3.99999 cm/s. When the ﬁrst one crosses the ﬁnish line, how far behind is the second one? Answer in units of cm.
A 10.0- shell is traveling horizontally to the right at 25.0 relative to the ground when it explodes into two fragments, one of mass 3.00 and the other of mass 7.00 . The lighter fragment goes directly forward, and the explosion releases 1.50 × 103 of mechanical energy to the fragments. Find the magnitude of the velocity of the heavier fragment relative to the ground just after the explosion.
a 2.50 g ice flake is released from the edge of a hemispherical bowl whose radius r is 31.0 cm. The flake-bowl contact is frictionless. what is the speed of the flake when it reaches the bottom of the bowl?
Resolution of a camera A certain camera lens of focal length 50.2 can focus on objects from 34.0 to infinity, and its aperture can vary from f/1.2 to f/32.Part A If the resolution of this lens is limited by the Rayleigh criterion, what is the shortest object it can resolve at f/32 at the closest focus distance if it is using light of wavelength 550 ? = Part B What is the size of the image on the film in part A? = Part C If a 133 lens had the same range of f-stops (/1.2 to /32), what would be the shortest object it could resolve at f/32 at a distance of 34.0 from the lens? =
A 77 g arrow is fired from a bow whose string exerts an average force of 95 N on the arrow over a distance of 82 cm. What is the speed of the arrow as it leaves the bow?
A ball is thrown horizontally from the top of a building 110 m high. The ball strikes the ground 54 m horizontally from the point of release. What is the speed of the ball just before it strikes the ground? Answer in units of m/s.
The 3.5 , 35-cm-diameter disk in the figure is spinning at 340 How much friction force must the brake apply to the rim to bring the disk to a halt in 2.4?
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