Question

- A block of limestone having a volume of 1.00 x 10-3 m3 has a mass of 2.711 kg. A stone mason shapes the block into a sphere having a radius of 5.00 cm. What is the mass of the sphere?
- A car drives 50.0 km due south. Then it turns onto another highway and drives 70.0 km in a direction 40.0o south of east. How far is the car from the place it started?
- A car accelerates from an initial speed of 20.0 m/s with an acceleration of 1.25 m/s2. After the car has traveled 150 m, how fast is the car moving?
- A spelunker drops a rock down a crevice and measures the time for it to make a splash in a pool below. If the rock takes 0.750 s to reach the pool, how far did it fall?
- An archer shoots an arrow into the air with an initial speed of 30.0 m/s at an angle of 50.0o to the horizontal. As it falls back toward the ground, the arrow lodges in a tree 86.8 m away. How far above the arrow’s initial height does the arrow lodge in the tree?
- The tip of a helicopter’s rotor blade moves in a circle 8.23 m in radius with an angular speed of 258 revolutions per minute. What is the centripetal acceleration of the tip of the blade?
- A 7.00 kg drawer is pulled open with a force of 12.0 N. If the frictional force opposing the motion of the drawer is 2.50 N, what is the acceleration of the drawer?
- A weightlifter lifts a 800 N barbell with an upward acceleration of 2.25 m/s2. What upward force does the weightlifter exert on the barbell?
- Starting at rest, a two-man bobsled team pushes a 390 kg bobsled to a final speed of 11.0 m/s while traveling 50.0 m. What net force acts on the bobsled?
- A physics book with a mass of 2.50 kg rests on a large sheet of newsprint on a horizontal surface. The coefficient of static friction between the book and the newsprint is 0.400. What maximum acceleration can be given to the book by pulling in a horizontal direction on the sheet of newsprint without the book sliding across the newsprint.

Answer #1

In the figure, a 5.40 kg block is sent sliding up a plane
inclined at θ = 37.0° while a horizontal force
of magnitude 50.0 N acts on it. The coefficient of
kinetic friction between block and plane is 0.330. What are the
(a) magnitude and (b) direction
(up or down the plane) of the block's acceleration? The block's
initial speed is 4.30 m/s. (c) How far up the
plane does the block go? (d) When it reaches its
highest...

Robin would like to shoot an orange in a tree with his bow and
arrow. The orange is hanging ?f=5.00 myf=5.00 m above the ground.
On his first try, Robin looses the arrow at ?0=32.0 m/sv0=32.0 m/s
at an angle of ?=30.0°θ=30.0° above the horizontal. The arrow has
an initial height of ?0=1.50 m,y0=1.50 m, and its tip is ?=53.0
mx=53.0 m away from the target orange.
Treating the arrow as a point projectile and neglecting air
resistance, what is...

An airboat with mass 4.38 102 kg, including the passenger, has
an engine that produces a net horizontal force of 8.12 102 N, after
accounting for forces of resistance.
(a) Find the acceleration of the airboat. ____________m/s^2
(b) Starting from rest, how long does it take the airboat to
reach a speed of 16.5 m/s?_______________s
(c) After reaching that speed, the pilot turns off the engine
and drifts to a stop over a distance of 50.0 meters. Find the
resistance...

1. A 25 kg skydiver has a speed of 20 m/s at an altitude of 350
m above the ground. Determine the kinetic energy possessed by the
skydiver.
2. If a cruise ship travels 150 km to the south and then 250 km to
the west, what is the ship’s displacement from its starting
point?
3. A train is accelerating at a rate of 5 m/s . If its initial
velocity is 15 m/s, what is its speed after 10...

3-A 1.0 kg block slides down an inclined plane of 39
0 from the horizontal. If the
block starts from rest and hits the bottom in 5.1 s,
what is the speed of the block, in the unit m/s, at the bottom of
the incline? Assume a frictionless plane.
4-A bus negotiates a turn of radius 103 m while traveling at a
speed of 92 km/h. If slipping just begins at this speed, what is
the coefficient of static friction between the...

A small block on a frictionless, horizontal surface has a mass
of 2.50×10−2 kg . It is attached to a massless cord passing through
a hole in the surface (Figure 1) . The block is originally
revolving at a distance of 0.300 m from the hole with an angular
speed of 2.33 rad/s . The cord is then pulled from below,
shortening the radius of the circle in which the block revolves to
0.150 m. Model the block as a...

a) An oil droplet with a mass of 7.20 x 10-16 kg is
moving upward at a constant speed of 2.0 m/s between two horizontal
charged plates. If the electric field strength between the plates
is 2.20 x 104 V/m what is the charge on the oil droplet
? answer in the format of a.bc x 10-de C
b) An oil droplet with a mass of 3.50 x 10-15 kg
accelerates downward at a rate of 2.50 m/s2 when it...

A small block on a frictionless, horizontal surface has a mass
of 2.50×10−2 kg . It is attached to a massless cord
passing through a hole in the surface (Figure 1) .The block is
originally revolving at a distance of 0.300 mfrom the hole with an
angular speed of 2.99 rad/s . The cord is then pulled from below,
shortening the radius of the circle in which the block revolves to
0.150 m. Model the block as a particle.
-Find...

One particle has a mass of 2.11 x 10-3 kg and a
charge of +8.91 μC. A second particle has a mass of 7.27 x
10-3 kg and the same charge. The two particles are
initially held in place and then released. The particles fly apart,
and when the separation between them is 0.128 m, the speed of the
2.11 x 10-3 kg-particle is 142 m/s.
Find the initial separation between the particles.

One particle has a mass of 4.58 x 10-3 kg and a
charge of +6.79 μC. A second particle has a mass of 8.66 x
10-3 kg and the same charge. The two particles are
initially held in place and then released. The particles fly apart,
and when the separation between them is 0.193 m, the speed of the
4.58 x 10-3 kg-particle is 191 m/s. Find the initial
separation between the particles.

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