A meteorologist has released a weather balloon to collect data. If the meteorologist wants the balloon to hover above the Earth's surface, what
two forces need to be changed. Select the best TWO answers that fit the
question. (Hint: This is for two different scenarios.)
Buoyancy
Force -28N
Drag Force-6N
Gravitational Force-16N

The gravitational force needs to be increased by 6 Newtons.
The buoyancy force needs to be decreased by 6N
The buoyancy force needs to be increased by 6N
The drag force needs to be twice the buoyancy force
The drag force needs to be decreased by 2 Newtons.

1. how much energy is needed to raise the temperature of 40.0 g of argon from 25c to 40c? the specific heat capacity of argon is 0.520 j/(g·k) 2a. 23.0 ml of 0.100 m hcl (standard) are added from a buret to neutralize 50.0 ml of an unknown basic solution. 2b. if the oh- produced in the previous reaction came from ca(oh)2, then what is the molarity of the ca(oh)2? 3.calculate the new freezing-point of a solution when 60.5 grams of cacl2 solute is dissolved in 0.612 kg of water. 4. what is the maximum number of moles of alcl3 that can be produced from 5.0 mol al and 6.0 mol cl2? 5. a sample of oxygen gas has a volume of 150 ml when its pressure is 0.923 atm. if the pressure is increased to 0.987 atm and the temperature remains constant, what will the new volume be? 6. nitrogen gas in a closed container at a temperature of 100.0 oc and 3.0 atm is heated to 300 oc. what is the pressure of the gas at the higher temperature?

The force it would take to accelerate an 900-kg car at the rate of 6m/s2

Would it be correct to say the doppler effect is the apparent change in the speed of a wave due to the motion of the source? be sure to fully explain your position using at least 3 complete content related sentences.