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1) An object is suspended from a spring scale in an elevator. The reading of the scale is 200 N when the elevator is at rest. If the balance reading is 190 N, the elevator is moving.
a. down at constant speed.
b. down and increasing in speed.
c. up at constant speed.
d. down and decreasing in speed.
2) A 92.0kg baseball player slides into second base. The coefficient of friction between the player and the ground is 0.61. If the player comes to rest after 1.2s, what was his initial speed? Round to one decimal place and include units.
3) A boy is pushing a 60 kg box along the floor by applying a horizontal force of 150N. The box is accelerating at a rate of 0.5 m/s2. What is the net force on the box? Round to the nearest whole number and include units.
You ask one of the archers to pull back her bowstring as far as possible and shoot an arrow horizontally. The arrow strikes the ground at an angle of 86 degrees from the vertical at a distance of 100 feet from the archer. What is the answer to you..
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With what speed must a ball be thrown vertically from ground level to rise to a maximum height of 36 m
A small block is attached to an ideal spring and is moving in SHM on a horizontal, frictionless surface. When the amplitude of the motion is 0.090m, it takes the block 2.44s to travel from x= 0.090m to x= -0.090m . If the amplitude is doubled, to..
A geologist finds that a Moon rock whose mass is 9.64kg has an apparent mass of 6.25kg when submerged in water. What is the density of the rock
A mountain climber wears a goose down jacket 3.3cm thick with total surface area 1.2m^2 . The temperature at the surface of the clothing is -20C and at the skin is 34 C. Determine the rate of heat flow by conduction through the jacket
When a softball player swings a bat, she accelerates it from rest to an angular velocity of 10 rad/s in a time of 0.27686 seconds. find the magnitude of the torque she applies to the end of the bat
an analysis of variances produces df 3 and df 24. if each treatment has the same number of participants then how many
A rocket fires two engines simultaneously. One produces a thrust of 725 N directly forward while the other gives a thrust of 513 N at an angle 32.4^\circ above the forward direction. Find the magnitude of the resultant force
A 50.0 ball of clay traveling east at 8.00 collides and sticks together with a 40.0 ball of clay traveling north at 8.00. Illustrate what is the speed of the resulting ball of clay?
Positive charge Q is distributed uniformly along a thin plastic rod that forms one quarter of a circle in the third quadrant of the x-y plane. The circle has radius a and its center is at the origin.
The index of refraction of silicate flint glass for red light is 1.620 and for violet light is 1.660. Find the angular separation between the red and violet components of the spectrum that emerges from the glass
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