The half-life of radium is 1690 years. If 8C ) grams are present now.how much will be present in 840 years? square grams (Do not round until the final answer. Then round to the nearest thousandth as needed.)
Which of the following is correct about Neptune (Pick All Correct Answers)? has the Great Dark Spot, periodically is bluish due to methane has an axial tilt of about 90 degrees had Voyager II visit it
A person weight is 1020 N on the ground level of Planet X. What is the person weight in a high-altitude balloon at 310 km above the ground? (R_(Planetx)=15.5cdot 10^6 m and gPlanet x= 18.5m/s^2 1012 N 993 N 986N 980 N
Jets flowing in opposite direction away from a central object. Jets Multipolar flows Bipolar flows
What is the name of the scientist who discovered that all elements have a unique spectrum? Bohr Ptolemy Copernicus Kepler
Question 7 Which of the following statements regarding Venus rotation is true? It rotates in a retrograde direction compared to its orbital direction. It rotates synchronously so that one revolution around the sun is also one rotation It is tidally locked to the Sun. It does not rotate at all. Question 8 Why does Mercury have a thin layer of hydrogen and helium near its surface? These gases are released during impacts with comets. These are outgassed by rocks in Mercury's crust. Other elements move fast enough to escape Mercury's gravity. Mercury temporarily traps solar wind particles.
In an inductor, when the voltage waveform is at 270 degrees, the current waveform will be at __ a. maximum positive b. zero c. maximum negative d. rms value
A load is any device that uses: Power Resistance Heat Energy Weight
The speed of a motor is determined by: 7,200 divided by the number of poles The horse power of the motor The rotor and the bearing size The number of windings in the rotor
What did Newton discover about gravity that was not known at the time? The Newtonian synthesis The equation for the force of gravity The law of universa gravitation All of the above
$\square $ Answer Bank KE: 1000.0 J PE: 3000.0 J KE: 0J $PE:4000.0J$ KE: 2000.0 J PE: 2000.0 J KE: 4000.0 J PE: 0J
Learning Log: How do you think you get something to have more kinetic energy?
If a UV light unit has four lamps in it, and each lamp is 7-watt, it is known as a __ 7-watt unit 28-watt unit 11-watt unit 3-watt unit
10. What is the mass of a meteorite that is traveling towards Earth at $1,760m/s$ with a momentum of $33,400kgm/s$
Where is the energy coming from in the lab (where does it start)? A Potential energy in the Cheeto B Potential energy in the water C Kinetic energy inside the water D Kinetic energy in the Cheeto
What should happen to the temperature of the water? A It stays the same B It goes down C It goes up
9. Your local weather report announces that the barometric pressure is 30.44 inHg. Convert this pressure to psi, atm torr, and Pa.
Express the temperature, 275.18 K in degrees Celsius. $548.33^{\circ }C$ $274.17^{\circ }C$ $2.03^{\circ }C$ $120.88^{\circ }C$ $22.78^{\circ }C$
Hubble's Law has led physicists and astronomers to the hypothesis that the universe is expanding. True False
Newton determined that the force of gravity on an object is proportional to its mass causing its mass to be canceled out (Newton's second law) and resulting in a constant acceleration. If the laws of physics are universal, then Newton should be able to apply his discoveries about gravity on Earth to the motion of the planets in our Solar System. Newton's third law says that for every force there is an equal reaction force in the opposite direction. What does this imply about the force of gravity associated with a person standing on the Earth? Choose one: A. The force of gravity on the person cancels out to zero. B. The Earth's gravity pulls downward on the person but also pushes upward on them. C. The Earth's gravity pulls downward on the person, and the person's gravity pulls upward on the Earth. D. There is twice as much gravitational force on the person than there would be if it weren't for Newton's third law.
