In a lab experiment, a student is trying to apply the conservation of momentum. Two identical balls, each with a mass of 1.0 kg, roll toward each other and collide. The velocity is measured before and after each collision. The
collected data is shown below.
Trial 1
Trial 2
Trail 3
Trial 4
Initial Velocity Initial Velocity Final Velocity Final Velocity
Ball A
Ball B
Ball A
Ball B
(m/s)
(m/s)
(m/s)
(m/s)
+1.0
-2.0
-2.0
-1.0
+0.5
-1.5
-0.5
-0.5
+2.0
+1.0
+1.0
-2.0
+0.5
-1.0
+1.5
-1.5
Which trial shows the conservation of momentum in a closed system?
Trial 1
Trial 2
О СО
Trial 3
Trial 4

The sun generates both mechanical and electromagnetic waves. which statement about those wave is true?

For problems 1-3, consider a simple dc brush motor with a permanent magnet stator. with an an consider a simple dc brush motor with a permanent magnet ae supply voltage of 100 v, the no-load speed of the motor is 1000 rpm. this motor can provide a torque of 1.9 n-m at 800 rpm drawing a current of 2 a current are both zero at no load.) 1. with an armature supply voltage of 100 v, the motor is operated at 900 rpm. what is the motor torque? what is the mechanical power delivered by the motor? what is the current draw? what is the electrical power input? what is the energy efficiency of the motor? with an armature supply voltage of 100 v, the motor is operated at 1100 rpm (where it acts as a generator). what torque input is required? what mechanical power is required what current is generated? what is the electrical power generated? what is the energy efficiency of the motor acting as a generator? 2. with an armature supply voltage raised to 120 v, the motor is operated at 1000 rpm. what is the no-load speed? what is the motor torque? what is the mechanical power delivered by the motor? what is the current draw? what is the electrical power input what is the energy efficiency of the motor? 3.

When an object is heated it contracts. a. true b. false