Two spaceships a and 8 are moving in opposite directions. each measures the speed of the other to be (3js)e. they pass alongside each other and each sets its clocks to zero at that instant. ship a receives a light-message at time t = 320 hours on its clocks that there has been an explosion in 8 that destroyed 8's oxygen generating plants and also left them unable to alter their velocity. the occupants of8 know that they have only enough oxygen to survive 1000 hours (on 8 's clocks). ship a, immediately upon receiving the message, sends rescue ship c to b. the velocity ofc, as measured by a, is (4js)e. assume that 8 sent the message simultaneously with the explosion and that c was dispatched simultaneously with the receipt of the message by a. (a) how long must the crew of8 wait for rescue, according to a, from the time of the explosion to the time that c arrives? (b) how long is this time interval according to the clocks of 8? were they rescued or not? hint: start by drawing a sequence of four pictures in a's rest frame, each picture representing an important event in the story.

Orque can be calculated by multiplying the force (n) applied at 90? to the lever arm at a distance (m) from the pivot point (point of rotation), the compound si unit for the torque is n? m. if the force (at 90? to the lever arm) applied is 15 n and it is applied at 2.0 m from the pivot point (point of rotation), what is the torque on the lever?

Need asap ! what is the relationship between atmospheric pressure and the density of gas particles in an area of increasing pressure? (2 points) as air pressure in an area increases, the density of the gas particles in that area decreases. as air pressure in an area increases, the density of the gas particles in that area increases. as air pressure in an area increases, the density of the gas particles in that area remains constant. as air pressure in an area increases, the density of the gas particles in that area increases and decreases in an alternating pattern. 3. which of the following correctly describes a way in which earth's atmosphere interacts with the geosphere? (2 points) it contains gases that living organisms breathe. it contains gases that trap incoming solar radiation. it provides a medium for cycles that provide nutrients to living organisms. it provides a medium for water to move between earth's surface and the air. 4. which of the following is considered a drawback to using wind energy as a source of power? (2 points) wind energy is nonrenewable. wind energy produces large amounts of air pollution. 5. a meteorologist predicts that the weather in a region will soon change from clear skies to probable thunderstorms. prior to making this prediction, what did the meteorologist most likely observe on a barometer? (2 points) the barometer fell slightly. the barometer fell substantially. the barometer rose slightly. the barometer rose substantially. 6. which of the following do meteorologists not typically use weather balloons to record? (2 points) atmospheric pressure cloud types humidity temperature 7. during which step in the can crush lab did water vapor force air from the can? (2 points) the can was filled nearly to the top with water. the can was placed on the hot stove top burner for several minutes. the can was removed from the hot stove top burner. the can was placed upside-down in the water-filled pan.

Aweight lifter raises a 1600 n barbell to a height of 2.0 meters. how much work was done? w = fd question 6 options: 3000 joules 30 joules 320 joules 3200 joules