PHYS Straighterline
A 0.200 kg dart is fired horizontally at a speed of 2.75 m / s when it hits a 0.700 kg block of
wood suspended by a string. The nose of the dart sticks into 0.00210 m the wood. Together the
dart and block swing upwards from a height of 0.0500 m above a table to 0.128 m above the
table. Which of the following is the average force the dart applies to the block during impact? -
ANS -32.4 N
\A 0.400 kg iron horseshoe that is initially at 500oC is dropped into a bucket containing 20 kg of
water at 22oC. What is the final equilibrium temperature? Neglect any heat transfer to or from
the surroundings. The specific heat of iron is 452 J/(kg Co). - ANS -23.0oC
\A 0.500 kg steel ball is dropped from a height of 4.00 m onto a horizontal steel slab. The
collision appears elastic in that the ball rebounds to its original height. If the collision lasts for
2.00 × 10−3 s, which of the following is the impulse imparted to the ball and the average force
applied to the ball during the collision? - ANS -I = 8.85 kg•m / s
F = 4.43 × 103 N
\A 1,450 kg car moves with a speed of 25.0 m / s when it collides with a stationary car having a
mass of 1,550 kg. The two vehicles lock bumpers on impact. The two cars then collide with a
stationary third car of mass 1,250 kg. During this second impact, the third vehicle becomes
attached to the second but the first car is breaks free and moves at 0.125 m / s in the opposite
direction. Which of the following is the final velocity of the second and third cars after the final
collision? - ANS -13.01 m / s
\A 17 kg particle... magnitude equal to - ANS -0.00 Nm
\A 200 g plastic ball is at rest on a frictionless incline 0.658 m above the surface of a table. The
ball then rolls down the incline and across the table, coming to rest after a distance of 2.45 m.
Which of the following the average friction on the ball while rolling across the table. - ANS
-0.527 N
\A 3.5 kg object is placed on a frictionless incline as shown in the diagram. The object's initial
velocity is zero and it starts to slide down the incline. What are the acceleration and final velocity
of the object when it reaches the ground level? - ANS -a = 5.6 m / s2
v = 8.9 m / s
\A 3000 kg satellite is in a circular orbit around the Earth. The radius of the orbit is r0. Using the
energy diagram, what is the value of r0? The mass of the Earth is 6 × 1024 kg. - ANS -6.0 x
10^7 m
\A 309 g glass rolls down an incline and onto a horizontal platform where it hits a beverage can
that is laying at rest on its side. The top of the incline is 11.0 cm above the horizontal platform.
The beverage can is initially at rest and weighs 7.35 N. Which of following is the final velocity of
the glass? - ANS -−0.612 m / s
\A bicyclist is heading east along a straight bike path. As the path crosses into a state park, it
turns from dirt to pavement and the biker accelerates at a constant rate of 1.2 m / s2. At time t =
0 the bicyclist is 2.0 m east of the state park line and is going at a speed of 3.0 m / s. Where is
the cyclist when his velocity is 10.0 m / s? - ANS -40
, \A binary star system consists of a star of mass M and a second star of mass 3M. They orbit in
circular paths around their common center of mass with radii ra and rb, respectively (see the
diagram). Which expression below is correct for the speed of the larger star, vb? - ANS
-(GMrb)1/2 / (ra + rb)
\A binary star system consists of two identical stars moving in circular orbits around the system's
center of mass (see the diagram). The mass of each star is M and the radius of the orbit is R.
Which expression correctly gives the orbital speed for one of the stars? - ANS -(GM/4R)1/2
\A boat pulls a water skier who weighs 127 lbs at a constant speed. The tension in the ski rope
is 125 N. The skier makes a run that is 0.7 km down a long straight river. What is the work done
by the water skier on the boat? - ANS -−8.75 × 104 N • m
\A brass cube, 10 cm on a side, is raised in temperature by 200oC. The coefficient of volume
expansion of brass is 57 x 10-6/Co. By what percentage does its volume increase? - ANS
-1.14%
\A car is decelerating from 60 mph to 0 mph in 122 ft. If the tires have a diameter of 18 in., how
many revolutions do the wheels make during the deceleration? - ANS -25.9 revolutions
\A car of mass 1365kg... wheels? - ANS -5%
\A car travels with a speed of 3.5 m / s, and then accelerates to 5.5 m / s in 4 s. Which of the
following is the average acceleration of the car? - ANS -0.5 m / s2
\A cart with mass m1 = 24 kg lies on an incline that makes an angle of 17° with the horizontal.
The coefficients of static and kinetic friction are 0.7 and 0.5 respectively. The cart is tied by an
ideal rope that runs through a frictionless pulley as shown in the diagram. What tension do you
need to apply to the free end of the rope in order to make the cart go up the incline at a constant
velocity? - ANS -181
\A certain galaxy is receding from observers on Earth at a speed of 0.94 c. Within that galaxy, a
star explodes, sending hot gases back towards the Earth. Relative to the galaxy, these gases
travel at a speed of 0.67 c. What is the speed of the gases relative to Earth? - ANS -0.73 c
\A child has only one pea left on her plate. Playing with her food she finds that if she tilts the
plate at an angle of 15 degrees or more, the pea starts to slide down. What is the coefficient of
static friction between the pea and the plate? - ANS -0.27
\A child is guiding a toy airplane attached to a guide wire around in a circle. The plane circles
with a period T. If the child pulls in the guide wire to half the original radius, while simultaneously
adjusting the speed so that the period T remains constant, how has the centripetal acceleration
changed? - ANS -The acceleration decreases by 2.
\A constant force is applied to an object that starts from rest. Which of the following best
describes its acceleration as a function of time? - ANS -straight horizontal line
\A dolphin trailing one of the Navy's aircraft carriers decides swim underneath the carrier. Does
the presence of the ship affect the pressure changes the dolphin feels as it dives? - ANS -No,
the pressure remains the same as when the ship wasn't there.
\A Ferris wheel having a radius of 8 m has a velocity of 8 m / s. Is there a danger of the riders
flying off? - ANS -No the Ferris wheel is not moving too fast.
\A force is applied to an object as shown. What is the direction of the torque vector? - ANS -into
the screen
\A freight train is traveling at a speed so that the angular velocity of its wheels is 38 rad / s. The
engineer decides to accelerate the train to a speed 1.5 times faster than before. If the
A 0.200 kg dart is fired horizontally at a speed of 2.75 m / s when it hits a 0.700 kg block of
wood suspended by a string. The nose of the dart sticks into 0.00210 m the wood. Together the
dart and block swing upwards from a height of 0.0500 m above a table to 0.128 m above the
table. Which of the following is the average force the dart applies to the block during impact? -
ANS -32.4 N
\A 0.400 kg iron horseshoe that is initially at 500oC is dropped into a bucket containing 20 kg of
water at 22oC. What is the final equilibrium temperature? Neglect any heat transfer to or from
the surroundings. The specific heat of iron is 452 J/(kg Co). - ANS -23.0oC
\A 0.500 kg steel ball is dropped from a height of 4.00 m onto a horizontal steel slab. The
collision appears elastic in that the ball rebounds to its original height. If the collision lasts for
2.00 × 10−3 s, which of the following is the impulse imparted to the ball and the average force
applied to the ball during the collision? - ANS -I = 8.85 kg•m / s
F = 4.43 × 103 N
\A 1,450 kg car moves with a speed of 25.0 m / s when it collides with a stationary car having a
mass of 1,550 kg. The two vehicles lock bumpers on impact. The two cars then collide with a
stationary third car of mass 1,250 kg. During this second impact, the third vehicle becomes
attached to the second but the first car is breaks free and moves at 0.125 m / s in the opposite
direction. Which of the following is the final velocity of the second and third cars after the final
collision? - ANS -13.01 m / s
\A 17 kg particle... magnitude equal to - ANS -0.00 Nm
\A 200 g plastic ball is at rest on a frictionless incline 0.658 m above the surface of a table. The
ball then rolls down the incline and across the table, coming to rest after a distance of 2.45 m.
Which of the following the average friction on the ball while rolling across the table. - ANS
-0.527 N
\A 3.5 kg object is placed on a frictionless incline as shown in the diagram. The object's initial
velocity is zero and it starts to slide down the incline. What are the acceleration and final velocity
of the object when it reaches the ground level? - ANS -a = 5.6 m / s2
v = 8.9 m / s
\A 3000 kg satellite is in a circular orbit around the Earth. The radius of the orbit is r0. Using the
energy diagram, what is the value of r0? The mass of the Earth is 6 × 1024 kg. - ANS -6.0 x
10^7 m
\A 309 g glass rolls down an incline and onto a horizontal platform where it hits a beverage can
that is laying at rest on its side. The top of the incline is 11.0 cm above the horizontal platform.
The beverage can is initially at rest and weighs 7.35 N. Which of following is the final velocity of
the glass? - ANS -−0.612 m / s
\A bicyclist is heading east along a straight bike path. As the path crosses into a state park, it
turns from dirt to pavement and the biker accelerates at a constant rate of 1.2 m / s2. At time t =
0 the bicyclist is 2.0 m east of the state park line and is going at a speed of 3.0 m / s. Where is
the cyclist when his velocity is 10.0 m / s? - ANS -40
, \A binary star system consists of a star of mass M and a second star of mass 3M. They orbit in
circular paths around their common center of mass with radii ra and rb, respectively (see the
diagram). Which expression below is correct for the speed of the larger star, vb? - ANS
-(GMrb)1/2 / (ra + rb)
\A binary star system consists of two identical stars moving in circular orbits around the system's
center of mass (see the diagram). The mass of each star is M and the radius of the orbit is R.
Which expression correctly gives the orbital speed for one of the stars? - ANS -(GM/4R)1/2
\A boat pulls a water skier who weighs 127 lbs at a constant speed. The tension in the ski rope
is 125 N. The skier makes a run that is 0.7 km down a long straight river. What is the work done
by the water skier on the boat? - ANS -−8.75 × 104 N • m
\A brass cube, 10 cm on a side, is raised in temperature by 200oC. The coefficient of volume
expansion of brass is 57 x 10-6/Co. By what percentage does its volume increase? - ANS
-1.14%
\A car is decelerating from 60 mph to 0 mph in 122 ft. If the tires have a diameter of 18 in., how
many revolutions do the wheels make during the deceleration? - ANS -25.9 revolutions
\A car of mass 1365kg... wheels? - ANS -5%
\A car travels with a speed of 3.5 m / s, and then accelerates to 5.5 m / s in 4 s. Which of the
following is the average acceleration of the car? - ANS -0.5 m / s2
\A cart with mass m1 = 24 kg lies on an incline that makes an angle of 17° with the horizontal.
The coefficients of static and kinetic friction are 0.7 and 0.5 respectively. The cart is tied by an
ideal rope that runs through a frictionless pulley as shown in the diagram. What tension do you
need to apply to the free end of the rope in order to make the cart go up the incline at a constant
velocity? - ANS -181
\A certain galaxy is receding from observers on Earth at a speed of 0.94 c. Within that galaxy, a
star explodes, sending hot gases back towards the Earth. Relative to the galaxy, these gases
travel at a speed of 0.67 c. What is the speed of the gases relative to Earth? - ANS -0.73 c
\A child has only one pea left on her plate. Playing with her food she finds that if she tilts the
plate at an angle of 15 degrees or more, the pea starts to slide down. What is the coefficient of
static friction between the pea and the plate? - ANS -0.27
\A child is guiding a toy airplane attached to a guide wire around in a circle. The plane circles
with a period T. If the child pulls in the guide wire to half the original radius, while simultaneously
adjusting the speed so that the period T remains constant, how has the centripetal acceleration
changed? - ANS -The acceleration decreases by 2.
\A constant force is applied to an object that starts from rest. Which of the following best
describes its acceleration as a function of time? - ANS -straight horizontal line
\A dolphin trailing one of the Navy's aircraft carriers decides swim underneath the carrier. Does
the presence of the ship affect the pressure changes the dolphin feels as it dives? - ANS -No,
the pressure remains the same as when the ship wasn't there.
\A Ferris wheel having a radius of 8 m has a velocity of 8 m / s. Is there a danger of the riders
flying off? - ANS -No the Ferris wheel is not moving too fast.
\A force is applied to an object as shown. What is the direction of the torque vector? - ANS -into
the screen
\A freight train is traveling at a speed so that the angular velocity of its wheels is 38 rad / s. The
engineer decides to accelerate the train to a speed 1.5 times faster than before. If the
