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A flight attendant pulls her 63 N flight bag a distance of 277 m along a level airport floor at a constant velocity. The force she exerts is 35 N at an angle of 57° above the horizontal. Find t
By applying a force of 50 N, a pulley system can lift a box weighing 396 N. What is the mechanical advantage of the pulley system?
Determine (a) the position, (b) the velocity, and (c) the acceleration of the particle at t = 3.00 s. (d) What is the maximum positive coordinate reached by the particle.
Eukaryotic cells can divide by mitosis or meiosis. In humans, mitosis produces new cells for growth and repair; meiosis produces sex cells (gametes) called sperm and eggs.
A man can row a boat at a speed of 7.90 km/h in still water. If he is crossing a river where the current is 1.60 km/h, in what direction should his boat be headed if he wants to reach a point direct
3.0 kg block is attached to a string that is wrapped around a 2.0 kg, 4cm-diameter hollow cylinder that is free to rotate. the block is released 1.0 m above ground. Use conservation of energy to fi
The bowler hears the sound of the ball hitting the pins 3.00 s after the ball is released from his hands. What is the speed of the ball?
A 5.80 cm diameter wire coil is initially oriented so that its plane is perpendicular to a magnetic field of 0.63 T pointing up. During the course of 0.15 s, the field is changed to one of 0.25 T po
Two seconds later the bicyclist hops on his bike and accelerates at 2.6 m/s^{2} until he catches his friend. How much time does it take until he catches his friend (after his friend passes him)?
What is the beat frequency when a 488 Hz tuning fork and a 498 Hz tuning fo
After falling from rest from a height of 29 m, a 0.47 kg ball rebounds upward, reaching a height of 19 m. If the contact between ball and ground lasted 2.5 ms, what average force was exerted on the
First what is a lysosome? Lysosomes are special vesicles in the cells which store large amounts of acidic material.
A 9.1 kg board is wedged into a corner and held by a spring at a 50.0° angle, as the drawing shows. The spring has a spring constant of 196 N/m and is parallel to the floor. Find the amount by w
The positive direction with speed but undergoing acceleration of magnitude in the negative direction. Find expressions for (a) the time when it returns to the position and (b) its speed when it pass
A 2-kg softball is pitched to you at 20 m/s and you hit the ball back along the same path but at twice the speed. If the bat was in contact with the ball for 0.1 second, what was the average force
A 2.5 kg rectangular air mattress is 2.00 m long, 0.500m wide, and 0.100 m thick. What mass can it support in water before sinking?
If a curve with a radius of 90 is properly banked for a car traveling 64 , what must be the coefficient of static friction for a car not to skid when traveling at 94 ?
When a certain rubber band is stretched a distance x, it exerts a restoring force of magnitude F=ax+bx^2 , where a and b are constants. the work done in stretching this rubber band from x=0 to x=L
If a tall round seed plant is crossed with another plant. From the following information provided
The speed of sound is 340 m/s. How far does the sound travel between wing beats? In other words, find the wavelength of the mosquito's sound.
What are the uses of chlorocyclohexene ?
Find (a) the magnitude and (b) the direction of the vehicle's velocity relative to the space station. Express the direction as an angle (in degrees) measured from the +y direction.
He is pushed a distance 3.00 m along the incline by a group of students who together exert a constant horizontal force of 595 N. The professor's speed at the bottom of the ramp is 1.70 m/s. What is
Independent assortment and crossing-over are two processes that assure what in sex cells?
The bacterial virus MI3 has a DNA genome that does not obey Chargaff's rules. Provide an explanation for this observation