What type of system allows matter and energy to enter and exit?

A. Closed

B. Open

C. Isolated

D. Connected

Calculate the force of gravity between two obejcts of masses 1300kg and 7800kg which are 0.23 apart

Based on Planet Z's size, orbital distance, and rotation rate, which of the following properties is it likely to have?

If object weighs 30 n on the earth whatvis its mass

A 42.5 g piece of aluminum (which has a molar heat capacity of 24.03 j/ocmol) is heated to 82.4oc and dropped into a calorimeter containing water (specific heat capacity of water is 4.18 j/goc) initially at 22.3oc.

A helicopter flies 250 km on a straight path in a direction 60° south of east. The east component of the helicopter's displacement is

Humpty Dumpty (12 kg) sat on a wall (2 m high). What was his potential energy, before his great fall? A. 235.2 J B. 235.2 N C. 24 J D. 246.1 W

Explain how we were able to boil water at room temperature

A car drives at 30km/h around a roundabout. I still the car accelerating?

It is well known that bullets and other missiles fired at Superman simply bounce off his chest. Suppose that a gangster sprays Superman's chest with 6.7 g bullets at the rate of 78 bullets/min, and the speed of each bullet is 530 m/s.

Seth starts from rest at the end of his driveway and accelerates down the road on a skateboard at 4 m/s squared 12 seconds what is the speed at the end of his 12 seconds