What is the apparent power of anAC circuit with a source voltage of 240V and a total current of 15A? 1.200W 2.400W 3.600W 7.200W
5. Two rods one made of brass and other made of copper are to be joined end to end. The length of the brass section is 0 .2 meters long. The length of the copper section is 0.7 meters long. Both rod sections have cross section of 0.004 square meters . The free end of the brass segment is in boiling water. The free end of the copper section is in an ice -water mixture. The pressure is one atmosphere for both rods The sides of the rods are insulated perfectly. No heat can leave the sides of the rods over the length of the rods.Please calculate the temperature of the point where the two rods are connected . Thank you.
Glass beads need to be placed in the balance tube when analyzing ; low surface area materials (one meter squared per gram or less). True False
Where would the gravitational force be the greatest? A At the beach on the East Coast C All the top of I a mountain At the bottom of the ocean B At the surface of the moon
Where does the ball feel the MOST centripetal force? Closest to the center It does not matter where the ball is , the same force is applied. Farthest from the center
A flat straight line shows the object's velocity is a. Increasing b. Decreasing c. Staying the same d. Has stopped
The event horizon of a black hole marks the inner boundary of a planetary nebul is a crystalline layer. is believed to be a singularity. has a radius equal to the Schwarzschild radius.
The amount of heat in an arc flash will instantly vaporize copper and expand it __ times its original volume. 54,000 74,000 64,000 44,000
Solid forms of ice last longer because there is more weight with less surface area. True False
The pressure you apply to the gas pedal is known as what? velocity force motion
100. A cup of hot chocolate has temperature $80^{\circ }C$ in a room kept at $20^{\circ }C$ After half an hour the hot chocolate cools to $60^{\circ }C$ a. What is the temperature of the chocolate after another half hour? b. When will the chocolate have cooled to $40^{\circ }C$
9. Explain how density differs from volume
The center of gravity of a load: should be kept as high as possible it makes no difference how the vehicle is loaded is only a problem if the vehicle is overloaded can make a vehicle more likely to tip over on curves
Which of the following best defines accuracy in scientific measurement? How precisely instruments are made The speed of taking measurements The number of decimal places in a measurement How closely measurements match the real or accepted value
What is being transferred in a wave? A matter B medium C energy D water
A sound wave with a small amplitude will sound A Loud B Quiet C High Pitched D Low Pitched
Which type of telescope would you need to easily see a potential neutron star? ultraviolet X-ray visible light infrared
9. When the worker uses a pulley system to lift a 40 kg object a vertical distance of 2 m, What type of energy conversion occurs to perform this work, and how is the energy stored once the object is lifted?
What produces waves? A Sound B Heat C Vibrations D Light
A sound wave with a low frequency will sound A Loud B Quiet C High Pitched D Low Pitched
