Mantle material rises in convection currents because heated material becomes more dense true or false

An athlete in the early weeks of an aerobic training program develops a decreased hemoglobin concentration but does not report disproportionate fatigue. Which of the following statements is true of the athlete's decreased hemoglobin levels? a.

A box is pulled up a rough ramp that makes an angle of 22 degrees with the horizontal surface. The surface of the ramp is the x-plane, What is the magnitude of the force of tensionit te ne force in the direction of 98 N2 57N 139 N 178N 183N F =

Anita is running to the right at 5 m/s, as shown in (Figure 1). Balls 1 and 2 are thrown toward her by friends standing on the ground. According to Anita, both balls are approaching her at 16 m/s.

Would you be doing more work going up the stairs twice as fast?

How does seafloor spreading provide further evidence of continental drift

An input force of 35 newtons is applied to a machine with a mechanical advantage of 0.75. what is the size of the load this machine could lift (how large is the output force) ?

Three children are riding on the edge of a merry-go-round that is 100 kg, has a 1.60-m radius, and is spinning at 20.0 rpm. The children have masses of 22.0, 28.0, and 33.0 kg. If the child who has a mass of 28.

A 3.62 g bullet moving at 270 m/s enters and stops in an initially stationary 2.30 kg wooden block on a horizontal frictionless surface.

A vertebra is subjected to a shearing force of 535 N. Find the shear deformation, taking the vertebra to be a cylinder 3.00 cm high and 4.00 cm in diameter. The shear modulus for vertebrae is 8.00 * 1010 N/m2.

A girl cycles for 2 hours at a speed of 25 km/hr. What distance did she travel?