Physics Force & Laws Of Motion Level: Misc Level
During a hockey a game a puck is given an initial speed of 5.50 m/s. If slides 54.00 m on the ice before it stops. What is the coefficient of kinetic friction between the puck and the ice?
a) 0.02
b) 0.03
c) 0.04
d) 0.05
Physics Force & Laws Of Motion Level: Misc Level
An object of mass m is hanging by a string from the roof of an elevator. We want to compare the tension in the string to the weight under various conditions. Which of these statements is /are true?
a) If the elevator is moving up at a constant speed the net force on the object is zero.
b) If the elevator is moving upwards and speeding up, the tension in the string is greater than the objects weight.
c) If the elevator is moving downwards in free fall, the tension in the string is equal to the objects weight.
d) If the elevator is moving downwards, and slowing down, the tension in the string is greater than the objects weight.
e) If the elevator is moving upwards, but slowing down the tension in the string is equal to the objects weight.
Physics Vectors Level: Misc Level
An object moves with constant (non-zero) acceleration. Which of these statements is/ are true?
a) The position must be increasing.
b) The acceleration must be increasing.
c) The velocity must continually change by the same amount.
d) The velocity must continually change by varying amounts depending on the speed.
e) The velocity must be decreasing.
Physics Vectors Level: Misc Level
A person walks on level ground 1.10 km east.Then 200.00 m south, and then climbs to a level on a monument that is 164.00 m from the ground. What is the displacement of the person in meter?
a) 783.15
b) 884.95
c) 1000.00
d) 1130.00
e) 1276.95
Physics Vectors Level: Misc Level
Two displacement vectors have magnitude 5.0 m and 7.0 m. Which of these statements is /are true?
a)When vectors are added the magnitude of the sum could be 4.0 m.
b)If the magnitude of the sum of the two vectors is 12 m, the angle between them must be 0 deg.
c)If the magnitude of the sum of the two vectors is 2 m, the angle between them must be 180 deg.
d)Only vectors of equal magnitude can be added together.
e)When these vectors are added, the magnitude of the sum could be larger than 12 m.
Physics Kinematics Level: Misc Level
You observe that a falling stone takes 0.40 s to pass a window that is 2.70 m tall. What is the speed of the stone, in m /s, as it reaches the bottom of the window?
Physics Kinematics Level: Misc Level
Coasting due west at 9.07 m /s,you encounter a sandy patch of road 6.4 m in length. When you leave the sandy patch, your speed has been reduced to 4.56 m/s. assuming that bicycle slows with constant acceleration, what was the acceleration in the sandy patch in m /s2 ?
Physics Heat & Thermodynamics Level: Misc Level
If 0.10 kg of ice at 0% C is added to 0.60 kg of water at 20 % C What is the final temperature of the water?
Physics Units Level: Misc Level
Change the temperatures:
F 0%F
C 0%C
K 273%K
Physics Rotational Mechanics Level: Misc Level
Assume that the spool is a solid cylinder of radius 0.1 m and mass 5.0 kg, and m =1.0 kg
Find the angular speed of the spool after the mass m has fallen 1.0 m.
Physics Rotational Mechanics Level: Misc Level
A student sits on a rotating stool holding two 3.0 kg masses. When his arms extended horizontally, the masses are 1.0 m from the axis of rotation, and he rotates with an angular speed of 0.75 rad/s, the moment of inertia of the student plus stool is 3.0 kg m 2, and is assumed to be constant. The student then pulls the masses horizontally to 0.20 m from the rotation axis.
Find the new angular speed of the student.
Physics Rotational Mechanics Level: Misc Level
A cable passes over a pulley. Because of friction, the tension in the cable is not the same on opposite side of the pulley. The force in one side is 110 N, and the force on the other side is 100 N. Assume that the pulley is a uniform disk of mass 2.0 kg and radius 0.5 m.
Determine its angular acceleration.
Physics Rotational Mechanics Level: Misc Level
An electric motor rotating a workshop grinding wheel at a rate of 50 rev/min is switched off. Assume constant deceleration of 1.0 rad /s2
How long does it take for the grinding wheel to stop?
Physics Properties Of Matter Level: Misc Level
What is the pressure change in water going from a 3. 0 m diameter pipe to 3.0 cm diameter pipe if the velocity in the large pipe is 0.4 m/s?
Physics Force & Laws Of Motion Level: Misc Level
Piston 1 has a diameter of 0.15 in: piston 2 has a diameter of 2.5 in. In the absence of friction, determine the force F, necessary to support the 1500 Ib weight.
