In spite of its high temperature, we observe the solar corona best during ________
Fill in the blank(s) with correct word
a total solar eclipse
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The acceleration of objects due to the gravitational force exerted on them is lower on the Moon than on Earth. Which one of the following statements is true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?
A) Mass is less, weight is the same. B) Mass is the same, weight is less. C) Both mass and weight are less. D) Both mass and weight are the same.
It takes 10 J of work to push a charge initially at rest into an electric field. If the charge is then released, it flies back to its initial position with a kinetic energy of
A) zero. B) 5 J. C) 10 J. D) more than 10 J. E) need more information.
A 3.0-kg block slides on a frictionless 20° inclined plane. A force of 16 N acting parallel to the incline and up the incline is applied to the block. What is the acceleration of the block?
a. 2.0 m/s2 down the incline b. 5.3 m/s2 up the incline c. 2.0 m/s2 up the incline d. 3.9 m/s2 down the incline e. 3.9 m/s2 up the incline
A car of mass 1689 kg collides head-on with a parked truck of mass 2000 kg. Spring mounted bumpers ensure that the collision is essentially elastic
If the velocity of the truck is 17 km/h (in the same direction as the car's initial velocity) after the collision, what was the initial speed of the car? A) 19 km/h B) 38 km/h C) 29 km/h D) 10 km/h