An airplane flies 40km directly south in 10 minutes and 20 km directly east in five minutes, its average speed is:

a) 2.98km/min

b) 2km/min

c) 8km/min

d) 4km/min

Work done by a constant force equal the magnitude of that is force multiplied by what?

A student places a cup of cold water on a counter in a warm room. The student measures the temperature of the water every minute until it stops changing. The water's final temperature is 28 degrees celsius. What is the final temperature of the room?

A net force of 150 N left is applied to an object that accelerates at a rate of 300 m/s2 to the left. What is the mass of the object? A) 0.5 kg B) 2 kg C) 450 kg D) 45,000 kg

Why permanent magnets are made up of steels and core of soft iron is made up of soft iron?

Rutherford tracked the motion of tiny, positively charged particles shot through a thin sheet of gold foil. Some particles traveled in a straight line and some were deflected at different angles.

Consider the moment when the spring is at its maximum compression. At that moment, the kinetic energy, the gravitational potential energy, and the elastic potential energy are, respectively, a - zero, at a maximum, and at a maximum b - at a maximum,

Ari, a young patient who is regularly treated by a psychiatrist, feels compelled to carry out repetitive tasks the same way very frequently. If Ari does not conduct these tasks with extreme precision, he can feel extremely nervous and uncomfortable.

A friend says, "Stars produce energy by a fusion chain reaction of helium into hydrogen." Evaluate the validity of this statement. A) It is an valid statement. Stars produce energy by a fusion chain reaction of hydrogen into helium.

If the mass of a material is 42 grams and the volume of the material is 15 cm^3, what would the density of the material be? answer: Unit:

35. An object of mass m moving at speed v0 strikes an object of mass 2m which had been at rest. The first object bounces backward along its initial path at speed v0.