Calculate the energy needed to heat 4 kg of water from 25°C to 45°C.

heat =

80 Kcal

100 Kcal

180 Kcal

280 Kcal

If B is added to C, the result is a vector in the direction of the positive y-axis with a magnitude equal to that of If C = zi + yj, where x=6.13 and y=7.12 what is the magnitude of B?

Circle O has a circumference of approximately 44 in. Circle O with diameter d is shown. What is the approximate length of the diameter, d?

Which of the following is a TRUE statement? a. It is possible for heat to flow spontaneously from a hot body to a cold one or from a cold one to a hot one, depending on whether or not the process is reversible or irreversible. b.

Team skates 65.0m in 23.2 seconds. What's the average speed?

The Earth is a spherical object which has a translational (orbital) velocity equal to 67,000 mph and a rotational velocity of 1,040 mph. Do you think there is Magnus force acting on the Earth?

When a brick is dropped from the roof of a house, it lands on the ground with a speed v. What will the speed at ground level be for an identical brick dropped from a roof twice as high as the first one?

The scientific method begins with recognizing a problem. The recognized problem in this scenario is, "Why is the printer in the office not working?" Choose the hypotheses that are testable and from which an experiment can be formed.

The correctly balanced equation for H2O2 → H2O + O2 is

How would an unbalanced chemical equation convey misleading information about what took place during a chemical reaction?

A car rounds a 75-m radius curve at a constant speed of 18 m/s. a ball is suspended by a string from the ceiling the car and moves with the car. the angle between the string and the vertical is: